[Drakelist] T4X SIDETONE REMAINS ON IN CW MODE
Discovered C132 (60 mfd ) open. What other value can be substituted that will work that is easier to find? ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x for sale
Have a T4x sn#12330, Have seen NO mods. Have cleaned all pots and switches,went thru all the tubes .The rigs chassis is ok,some pitting ,as normal,front panel, as new,dial and vfo clear and smooth,all knobs are fine. Cabinet is good,origional,no dents.NO SMOKE. Put on bench,found no idle current,while testing. Have another working transmitter,so will sell this one. Should be a easy fix. asking 150.00 split shipping. Please get back off line. thanks dale wt4t___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4X Troubles
T4X experts:I just finished a rebuild (Mike WB4VGE's kit) of the AC4 which came with the T4X. Excellent kit and instructions.The AC4 checked out as specified.Connecting the AC4 to the T4X IMMEDIATELY killed the 290VDC line and opened the two 200 ohm parallel sand resistors.Starting at pin 11 of the connector I unhooked the bypass cap, then one of the two red/white wires. The short (2 ohms to ground) stayed with the disconnected wire. I undid some of the wire ties and located a terminal strip near the function switch. There were two red/white wires.Disconnected one and the short stayed with the disconnected which goes to the function switch. Now the puzzle. If the function is AM the short goes away and the reading is in the several K ohms range.Of course, I was trying to set the bais in the tune position when the 290VDC line went ou.I need some advice. Where to go next?Thanks in advance and 73,Larry K3VX ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x am hifi mods
Carey, This must sound good. I've used the C-line twins on AM and have received good reports as is. But the idea of a dedicated AM set up sounds like a nice idea and TX-4s are not hard to find nor expensive. So why not? Once home I will listen for you and search out K1JJ to hear the difference. Kris KM2KM well my idea was to use the t4x and r4a as my am station. i did so a similar mod that made resting carrier adjustable to 20 watts. that was nice but then ssb would not play right. only one reply on this one so i am thinking this is not a very popular subject HI Carey - Original Message - From: Richard Knoppow 1oldle...@ix.netcom.com To: Carey Lockhart kc5...@gmail.com; drakelist@zerobeat.net Sent: Saturday, February 11, 2012 11:43 AM Subject: Re: [Drakelist] t4x am hifi mods - Original Message - From: Carey Lockhart kc5...@gmail.com To: drakelist@zerobeat.net Sent: Saturday, February 11, 2012 4:44 AM Subject: [Drakelist] t4x am hifi mods hello guys i found a modification on the am window reflector pages that changes the am to screen modulated hifi. here is the link. http://www.amwindow.org/tech/htm/t4.htm . my question is after the mod is the t4x dedicated to am or will ssb function as usual. also is there a better way of doing this been found since the article was written. -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com Since he disconnects the VOX pot to accomplish this I also wonder. I wonder about the untended concequences of many of the mods for Drake stuff especially those for improving the audio. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist Merschrod Sana'a, Yemen 712-543-509 ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x am hifi mods
hello guys i found a modification on the am window reflector pages that changes the am to screen modulated hifi. here is the link. http://www.amwindow.org/tech/htm/t4.htm . my question is after the mod is the t4x dedicated to am or will ssb function as usual. also is there a better way of doing this been found since the article was written. -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x am hifi mods
- Original Message - From: Carey Lockhart kc5...@gmail.com To: drakelist@zerobeat.net Sent: Saturday, February 11, 2012 4:44 AM Subject: [Drakelist] t4x am hifi mods hello guys i found a modification on the am window reflector pages that changes the am to screen modulated hifi. here is the link. http://www.amwindow.org/tech/htm/t4.htm . my question is after the mod is the t4x dedicated to am or will ssb function as usual. also is there a better way of doing this been found since the article was written. -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com Since he disconnects the VOX pot to accomplish this I also wonder. I wonder about the untended concequences of many of the mods for Drake stuff especially those for improving the audio. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x am hifi mods
well my idea was to use the t4x and r4a as my am station. i did so a similar mod that made resting carrier adjustable to 20 watts. that was nice but then ssb would not play right. only one reply on this one so i am thinking this is not a very popular subject HI Carey - Original Message - From: Richard Knoppow 1oldle...@ix.netcom.com To: Carey Lockhart kc5...@gmail.com; drakelist@zerobeat.net Sent: Saturday, February 11, 2012 11:43 AM Subject: Re: [Drakelist] t4x am hifi mods - Original Message - From: Carey Lockhart kc5...@gmail.com To: drakelist@zerobeat.net Sent: Saturday, February 11, 2012 4:44 AM Subject: [Drakelist] t4x am hifi mods hello guys i found a modification on the am window reflector pages that changes the am to screen modulated hifi. here is the link. http://www.amwindow.org/tech/htm/t4.htm . my question is after the mod is the t4x dedicated to am or will ssb function as usual. also is there a better way of doing this been found since the article was written. -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com Since he disconnects the VOX pot to accomplish this I also wonder. I wonder about the untended concequences of many of the mods for Drake stuff especially those for improving the audio. -- Richard Knoppow Los Angeles WB6KBL dickb...@ix.netcom.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x
Ok, got a good onemy t4x just started showing cathode current even when I don't have the key down on the mike or the cw key..its there all the time and I can hear a carrier on my r4 all the time...doesn't matter where the controls are set...seems the finals are in transmit all the time and the relay isn't pulling in, it only pulls in when I key the mike..I can even hear my voice in the r4 without the key down...h. 73 Bill Wa2jhs ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x
shut it off before the finals self destruct. bias supply probably the problem, bet the bias voltage is way down (less minus), and getting worse. Replace the electrolytics in the p.s., at least in the bias section. Cupla good suppliers for that job. 73, Al, W8UT www.boatanchors.org www.hammarlund.info There is nothing -- absolutely nothing -- half so much worth doing as simply messing about in boats Ratty, to Mole On 1/30/2012 4:47 PM, Bill wrote: Ok, got a good onemy t4x just started showing cathode current even when I don't have the key down on the mike or the cw key..its there all the time and I can hear a carrier on my r4 all the time...doesn't matter where the controls are set...seems the finals are in transmit all the time and the relay isn't pulling in, it only pulls in when I key the mike..I can even hear my voice in the r4 without the key down...h. 73 Bill Wa2jhs ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x
Bill - Sounds almost like it's in SPOT. Possibly a switch anomaly. There can't be PLATE (Cathode) current on the meter ''normally unless the relay is pulled in. Check carefully around the meter terminals, if one of the terminals is shorting to the chassis? So. Just a guess, but I'd look for a short across the relay contacts that ground the Cathodes of the PA. The set of contacts has the 'arm' grounded. When the relay is 'open' it grounds the MUTE line of the receiver, (enabling the receiver,) and when the relay is 'closed' it grounds the PA Cathodes. Let us know what you find, or if you get further symptom information. Like, what is the PLATE meter reading, idle or operating current. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Bill wrote: Ok, got a good onemy t4x just started showing cathode current even when I don't have the key down on the mike or the cw key..its there all the time and I can hear a carrier on my r4 all the time...doesn't matter where the controls are set...seems the finals are in transmit all the time and the relay isn't pulling in, it only pulls in when I key the mike..I can even hear my voice in the r4 without the key down...h. 73 Bill Wa2jhs ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4X trouble
Good morning to the list! I have just put an R4B and T4x on the air. I got on LSB 80M last weekend, and was told my signal sounded tinny with no lows. It was quite clear and readable though. Just low audio. After cleaning switches and pots, checking tubes etc., had a qso on USB 20M. Report was 10 over to Chicago, about a thousand miles from Houston. I can hear the difference in the audio when I monitor on another receiver. So it seems I have an audio problem on LSB only. I am seeing around 110 watts peak on both USB and LSB. Any thoughts or ideas are welcome. Thanks in advance, and a happy New Year to all!! 73 Larry KD5ECG - This e-mail and any attachments may contain confidential information. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this e-mail and destroy any copies. Any dissemination or use of this information by a person other than the intended recipient is unauthorized and may be illegal. This email has been scanned for Virus and Spam content by Wood Group___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4X trouble
Larry, it could be something as simple as an alignment issue, but there are also two crystal filters in there: one for each sideband. If all of your alignment settings are alright, check connections to the filter before deciding to replace the filter. How does the rig work on CW? 73, Steve Wedge, W1ES/4 I can't complain, but sometimes I still do. - Joe Walsh If the above message appears, it came from Steve's Son of Laptop! - Original Message - From: GRINDEL, Larry (GTS-PS) To: drakelist@zerobeat.net Sent: Thursday, December 29, 2011 7:16 AM Subject: [Drakelist] T4X trouble Good morning to the list! I have just put an R4B and T4x on the air. I got on LSB 80M last weekend, and was told my signal sounded tinny with no lows. It was quite clear and readable though. Just low audio. After cleaning switches and pots, checking tubes etc., had a qso on USB 20M. Report was 10 over to Chicago, about a thousand miles from Houston. I can hear the difference in the audio when I monitor on another receiver. So it seems I have an audio problem on LSB only. I am seeing around 110 watts peak on both USB and LSB. Any thoughts or ideas are welcome. Thanks in advance, and a happy New Year to all!! 73 Larry KD5ECG -- This e-mail and any attachments may contain confidential information. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this e-mail and destroy any copies. Any dissemination or use of this information by a person other than the intended recipient is unauthorized and may be illegal. -- -- ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x cw problem
Garey...I think it was you who said c132 was giving me a sidetone problem on my t4you were right...replaced it and no more errant sidetone 73 Bill sent via samsung android.. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x cw problem
Bill - Yes, a dried out (high ESR) electrolytic at C132 allows the SIDETONE from V9a AROUND the D8 keyer diode, and send it on to V11 via the B+ bus. Nice when they're easy! :-) 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line and TR-4/C Service Supplement CDs www.k4oah.com Bill Hendrickson wrote: Garey...I think it was you who said c132 was giving me a sidetone problem on my t4you were right...replaced it and no more errant sidetone 73 Bill ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4x problem
Using a r4a and a T4x for a long long time with no problems, recently all of a sudden the mute would not turn off in the cw or tune position. I could not hear the relay click, however in the ssb position all seemed to work ok. If anyone has a recommendation on how to fix this problem please let me know I would really really really appreciate it. Thank you in advance wa2ovj. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4x problem
Karl - If I'm interpreting your question correctly, try connecting a 40 - 80 uF @ 250V cap across C132 (the can cap next to V10). If not, check back with more information. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Karl Corder wrote: Using a r4a and a T4x for a long long time with no problems, recently all of a sudden the mute would not turn off in the cw or tune position. I could not hear the relay click, however in the ssb position all seemed to work ok. If anyone has a recommendation on how to fix this problem please let me know I would really really really appreciate it. Thank you in advance wa2ovj. ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4X-C. Now more output power and no RFI?
It sounds like something has changed in the antenna system or feed line. Bry, AF4K Hi to all My T4X-C always put out about 110 -120 watts, less on 20 - 10 meters. On 40 meters there was always RFI problems with our organ. Today, the T4X-C was putting out 150 watts on 80 meters. All the other bands had much more output power too. Amp meter said 400 - 450 mills. 320 - 350 mills is normal for me.400 - 450 amp mills seems to high? Is it? Now there is no RFI problem on 40 meters. What is going on? Any ideas? 73, Chuck - AA5WG Cedar, Michigan ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4X-C Won't maintain output
Hi to all: After aligning the T4X-C the power output is equal when switching between R4-C or T4X-C control via the transcieve switch on the transmitter. Now, the output is lower when the transcieve switch is in the T4X-C position. This is for 80 meters. I aligned the transmitter again and output is same/normal when switching between receive or transmitter control via the transcieve swithch on the T4X-C. Again, later, the output falls when selecting the transmitter control via the transceive swithch on the T4X-C. I may tune up the transmitter again. However, I am gettig tired of doing this. Any ideas what is going on? 73, Chuck ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4X-C Won't maintain output
Hmm. Several oddities with this. 1. Usually lower transmitter output is experienced when RCVR control is selected, bringing the PreMixer signal over from the receiver. 2. If it was a cable problem, 80M is the least likely to have increased losses as it is the lowest frequency PreMixer signal. 3. Why would transmitter alignment fix it, but only for a short while.? Most obvious is a problem with the TRANSCEIVE switch contacts. Have they been cleaned, DeoxIT'ed? If we were talking 10M, I'd suspect the trimmer cap adjustment changing since typically they are very near minimum capacitance and so have very low tension on the adjuster screws. But ... On 80M, what alignment adjustments would be drifting with time? Possibly a leaky mica cap on the PreMixer on the 80M band position. C142, C145, C156 or C185. Only other thought would be marginal levels from the PTO, Band Osc or PreMixer, falling off with time. Possibly a gassy V8? Be sure and let us know what you find! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Chuck Pool wrote: Hi to all: After aligning the T4X-C the power output is equal when switching between R4-C or T4X-C control via the transcieve switch on the transmitter. Now, the output is lower when the transcieve switch is in the T4X-C position. This is for 80 meters. I aligned the transmitter again and output is same/normal when switching between receive or transmitter control via the transcieve swithch on the T4X-C. Again, later, the output falls when selecting the transmitter control via the transceive swithch on the T4X-C. I may tune up the transmitter again. However, I am gettig tired of doing this. Any ideas what is going on? 73, Chuck ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4X-C. Now more output power and no RFI?
Hi to all My T4X-C always put out about 110 -120 watts, less on 20 - 10 meters. On 40 meters there was always RFI problems with our organ. Today, the T4X-C was putting out 150 watts on 80 meters. All the other bands had much more output power too. Amp meter said 400 - 450 mills. 320 - 350 mills is normal for me. 400 - 450 amp mills seems to high? Is it? Now there is no RFI problem on 40 meters. What is going on? Any ideas? 73, Chuck - AA5WG Cedar, Michigan ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4X ????
Hello fellow Drake Dudes I had my drake twins R-4A and T-4X working fine last year. Now when I fired up the T-4X transmitter in SSB I have a strong carrier the more mic gain the more carrier. Any ideas where to look first and I am about to go to work on it this week. Thank You Jim WB8REH -- Jim Theisen (WB8REH) It is better to keep silent and be thought a fool, than to speak and remove all doubt. My Daddy ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4X ????
This sounds like a carrrier balance pot is out of adjustment. From: Jim Theisen rf...@centurytel.net Hello fellow Drake Dudes I had my drake twins R-4A and T-4X working fine last year. Now when I fired up the T-4X transmitter in SSB I have a strong carrier the more mic gain the more carrier. Any ideas where to look first and I am about to go to work on it this week. Thank You Jim WB8REH -- Jim Theisen (WB8REH) It is better to keep silent and be thought a fool, than to speak and remove all doubt. My Daddy ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4X ????
Jim - Assuming you're not in TUNE mode, it's possible that the Carrier Balance adjustments have been bumped, or the pot may just have developed a 'dead' spot while in storage. Try adjusting the CAR BAL pot on the right rear corner of the chassis per the manual section Section IV, Tuning Procedure, paragraph C. You should also do paragraph A of the same section. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Jim Theisen wrote: Hello fellow Drake Dudes I had my drake twins R-4A and T-4X working fine last year. Now when I fired up the T-4X transmitter in SSB I have a strong carrier the more mic gain the more carrier. Any ideas where to look first and I am about to go to work on it this week. Thank You Jim WB8REH ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4X-B - Missing cap?
I can´t find C129 ( 60uF ) in my T4X-B. Is it missed or not used? Tks PY2GQT Luiz -.- Veja quais são os assuntos do momento no Yahoo! +Buscados http://br.maisbuscados.yahoo.com___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4X-B - Missing cap?
Luiz - C129 is the Twist-Lok aluminum can on the chassis just behind V11. If it needs to be replaced, Tom, N0JMY at www.hayseedhamfest.com has replacements as well as a complete recap kit for the Drake equipment. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com PY2GQT [Luiz] wrote: I can´t find C129 ( 60uF ) in my T4X-B. Is it missed or not used? Tks *PY2GQT Luiz *-.- ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x on cw
Hello to all and Happy New Year. I am having a strange problem with my t4x/r4 setup on cw. It works fine on tune/am/lsb and usb. It just doesn't work on CW.. I get the side tone on the r4 and the bias current shows up, but I don't get any rf output. Fine on all other modes. any suggestions??? 73 Bill Wa2jhs ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x on cw
Bill - OK, easiest first! :-) Does the relay pull in momentarily like Wiley's? Does the Sidetone key on and off? (I see we have a cross-posting problem here.) The component numbers for the T-4X are D8, R66 and R67 On CW, the Carrier Oscillator is shifted up in frequency about 900 Hz by switching C1 in series with the crystal. If the line to the S1c-Front wafer is shorted, the oscillator doesn't shift and so is outside the passband of the filter. Keyed Sidetone, but no CW. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com billjhs wrote: Lower x it is Bill Garey Barrell wrote: Bill - SIDEBAND switch set to Lower - X?? 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com billjhs wrote: Hello to all and Happy New Year. I am having a strange problem with my t4x/r4 setup on cw. It works fine on tune/am/lsb and usb. It just doesn't work on CW.. I get the side tone on the r4 and the bias current shows up, but I don't get any rf output. Fine on all other modes. any suggestions??? 73 Bill Wa2jhs ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
i need to start saving the trivia facts. this same question has been asked many times over i am sure. thanks On Fri, Dec 26, 2008 at 12:22 AM, Garey Barrell k4...@mindspring.comwrote: Carey - In my experience, Drake started using a spatter finish on the version 3 of the R-4A, which was well into the T-4X production. Early T-4X were indeed smooth satin black finish, as were the R-4 and R-4A version 1 and 2. The spatter finish went through the R-4B and then the textured finish started with the C-Line. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Carey Lockhart wrote: hi gang and merry christmas does the t-4x have the splatter paint job or a smooth paint on the case? Carey Lockhart, KC5GTT kc5...@gmail.com mailto:kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist -- Carey Lockhart, KC5GTT Boerne, Tx. 78006 www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
On Dec 25, 2008, at 7:57 PM12/25/08, Carey Lockhart wrote: hi gang and merry christmas does the t-4x have the splatter paint job or a smooth paint on the case? Mine has smooth paint... Tom WA8PYR ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
A correction to my earlier post. My early R4-B has the spattered not the textured finish. This is consistent with Garey's statement on the crossover point from smooth to textured. Dennis AE6C On Thu, Dec 25, 2008 at 7:21 PM, Dennis Monticelli dennis.montice...@gmail.com wrote: My early R4B is textured. On Thu, Dec 25, 2008 at 5:46 PM, Carey Lockhart kc5...@gmail.com wrote: well i think i will go with the smooth since thats what it is. i can always repaint later. my b line has textured paint but my older tr-4 does not. thanks for the help guys Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x case type
hi gang and merry christmas does the t-4x have the splatter paint job or a smooth paint on the case? Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
Chuck, thats strange. i wonder why they did that? the r-4a i have is textured. is yours? Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com On Dec 25, 2008, at 7:03 PM, Chuck Grandgent wrote: seems pretty smooth on the two that I have. Chuck, K1OM On Thu, Dec 25, 2008 at 7:57 PM, Carey Lockhart kc5...@gmail.com wrote: hi gang and merry christmas does the t-4x have the splatter paint job or a smooth paint on the case? Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
Smooth. The Polane paint jobs came later, I think it started with the C line. Lee, w0vt - Original Message - From: Carey Lockhart To: drakelist@zerobeat.net Sent: Thursday, December 25, 2008 6:57 PM Subject: [Drakelist] t4x case type hi gang and merry christmas does the t-4x have the splatter paint job or a smooth paint on the case? Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
My R-4A, T-4X and MS-4 are not textured. I bought them new and still have them. BTW, for my $, the R-4A is the best sounding receiver of the entire line. Merry Christmas and 73, John, W4AWM ** Don't be the last to know - click here for the latest news that will have people talking. (http://www.aol.com/?ncid=emlcntaolcom0021) ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
well i think i will go with the smooth since thats what it is. i can always repaint later. my b line has textured paint but my older tr-4 does not. thanks for the help guys Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
My early R4B is textured. On Thu, Dec 25, 2008 at 5:46 PM, Carey Lockhart kc5...@gmail.com wrote: well i think i will go with the smooth since thats what it is. i can always repaint later. my b line has textured paint but my older tr-4 does not. thanks for the help guys Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x case type
Carey - In my experience, Drake started using a spatter finish on the version 3 of the R-4A, which was well into the T-4X production. Early T-4X were indeed smooth satin black finish, as were the R-4 and R-4A version 1 and 2. The spatter finish went through the R-4B and then the textured finish started with the C-Line. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Carey Lockhart wrote: hi gang and merry christmas does the t-4x have the splatter paint job or a smooth paint on the case? Carey Lockhart, KC5GTT kc5...@gmail.com mailto:kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] t4x and r4a
well guys i picked up a couple clean pieces of gear. both of them have problems. i am hoping with a little help from the list i can get them going. i figure i should start with the receiver. after a lengthy visual inspection i can find no broken wires burnt resistors or any thing else. although the ob2 is yellow instead of blue like a oa2. all the front knobs seem to have some effect. the volume increases the ac hum. the passband and notch seem to change the sound. am and ssb seem to make a difference also. now when it is turned on the s meter pegs to right and stays there. i am not asking for hours online repair just a kick in the right direction. any help with these items would be most appreciated. Carey Lockhart, KC5GTT kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] t4x and r4a
Carey - Do you have a shorted RCA plug in the MUTE jack on the back panel? S/N of the R-4A? There are four versions, two each of a similar design. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Carey Lockhart wrote: well guys i picked up a couple clean pieces of gear. both of them have problems. i am hoping with a little help from the list i can get them going. i figure i should start with the receiver. after a lengthy visual inspection i can find no broken wires burnt resistors or any thing else. although the ob2 is yellow instead of blue like a oa2. all the front knobs seem to have some effect. the volume increases the ac hum. the passband and notch seem to change the sound. am and ssb seem to make a difference also. now when it is turned on the s meter pegs to right and stays there. i am not asking for hours online repair just a kick in the right direction. any help with these items would be most appreciated. Carey Lockhart, KC5GTT kc5...@gmail.com mailto:kc5...@gmail.com www.kc5gtt.com ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] T4X-C 6JB6/6JB6A Question
Hi Drakelist Would someone out there know the maximum plate current a pair of Sylvania 6JB6 / 6JB6A sweep tubes can handle without damaging the tube and what the T4X-C PA stage typically draws when tuned for maximum power output? I have read some conflicting information and would like to hear from someone with practical experience. I have a T4X-C which can deliver 150 W output on all bands but requires almost 350 ma to do so. Regards Wade VA3HM ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [Drakelist] T4X-C 6JB6/6JB6A Question
Hi Wade - First, and most important, is the fact that many (most) of the meter shunt resistors in 30 year old T-4XCs have gone up in value, causing the plate meter to read high. The resistor is R59, (3.3 ohm, 1/2W,) and is located on the T-R relay board. It should be replaced with a 1W ceramic comp or wirewound 'flameproof' depending upon what you can find. You will probably also need to replace R58, which is a 'select at test' resistor up on the meter switch (behind the LOAD control). It should be somewhere between 51 and 330 ohms, and be selected so the meter reads 70 mA when the DC voltage across R59 is 230 mV (for a 3.3 ohm resistor). This is the important reading, because this is what you set the final stage operating bias with, and determines the linearity and efficiency of the stage. The plate meters cost Drake a little under $1 each, so are not precision meters!! The 70 mA reading is far more important to tube life than the absolute resonant plate current at full output. The 6JB6 is specified at 17.5W plate dissipation. Maximum plate voltage is 770V (Drake uses 650V), and peak plate current is 550 mA, so plate dissipation is the only specification that is being stretched. This is at 100% operation, 24 hours a day, inside a closed TV cabinet with 20 other tubes in it. These conditions are worse than CCS (Continuous Commercial Service) in transmitter use. Using this specification, a pair of tubes would be capable of producing approximately four times this power, or about 70W INPUT in Class AB1 at 50% efficiency. Fortunately, amateur transmitter service is MUCH less demanding, and tubes are a LOT tougher than transistors!! Sylvania is the only tube manufacturer that actually tested sweep tubes in Linear amplifier service and published the data. There was an article in Ham Radio Magazine for April 1968 by Bill Orr that stated full-blast ratings (250 W PEP input) were not unrealistic, and good tube life may be achieved ... PROVIDED the operator does not 'cook' the tubes during tuneup. Cooking was defined as more than 30 seconds at full power in a 2 minute period. Obviously off resonance periods will cook them a LOT faster. Drake used Sylvania's data (published in 1964) in the design of the T-4X. The original tune-up instructions for the T-4X transmitters stated to adjust the TUNE and LOAD controls for maximum output. Some time later, the FCC modified the 'purity of emissions' regulations in Section 97.73, and Drake issued new Tuning Alterations for the T-4X series of transmitters. These changes specified limiting the final plate current to a maximum of 340 mA with the LOAD control on 160, 80, 40 and 20M. No change was recommended for 15 and 10M operation. The BEST thing you can do to get maximum tube life from 6JB6 finals is to add a small fan to the top or back of the PA cage, (BLOWING OUT,) to extract the hot air and move it away from the area. It doesn't have to be a big or noisy fan, a small, silent fan will drop the PA area temperature to approximately that of the rest of the transmitter. Obviously, tuning up quickly is also important, as is making sure you have the right antenna connected before starting tuneup! Off-resonance plate currents can exceed 450 mA! Neutralization is also important, and is worth the extra few minutes to get it right when replacing finals. Back in the 60's I ran three A and B lines in Autostart RTTY service on 20M at plate currents in the 350 - 380 mA range. The transmitters all had small fans, and ran 24/7. The stations were used in RTTY repeater service, ran at full power, and would often transmit in excess of 30 minutes key down. Under these conditions, final tubes lasted about two years, being replaced when the output at 14.075 MHz dropped from 150W to 100W. Obviously in CW and SSB service they should last MUCH longer. I have B and C Line transmitters in regular operation that have had the same final tubes for 10 or more years, and still have full output. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com wmacleod wrote: Hi Drakelist Would someone out there know the maximum plate current a pair of Sylvania 6JB6 / 6JB6A sweep tubes can handle without damaging the tube and what the T4X-C PA stage typically draws when tuned for maximum power output? I have read some conflicting information and would like to hear from someone with practical experience. I have a T4X-C which can deliver 150 W output on all bands but requires almost 350 ma to do so. Regards Wade VA3HM ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[drakelist] T4X parts info needed and Thanks for cap help on R4B
First, thanks everyone for the Hayseed site-I opted to pick up a fresh can and the few other electrolytic replacements for my R4B from Tom. I am also trying to help a friend find the transceive switch wafer and the relay for a T4X. Anyone have these or should we look for a junker. Thanks-Lew KlNDV
Re: [drakelist] T4X transformer 14
George Cortez Jr [EMAIL PROTECTED] made an utterance to the drakelist gang -- Thanks for the reply, Garey I did check it and it seemed ok. I did replace C9 a 27pf cap on the output of the xfmr because it was damaged when I removed T14. I put it all back together and now I see output. It gets down to the mixer and then gets weak. It never does make it to the driver tube. I may need to swap the mixer or driver tube and I have them on order. This is a first trouble shooting with Drake equipment and using the o scope. It makes things a lot easier. Thanks George Cortez NE2I Garey Barrell wrote: Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- George - Unless the coil is physically damaged, the problem might be with the diodes. They have a penchant for shorting to the can, or may just be blown. They are germanium 1N270s, but can be replaced with Schottky 1N5711 or other modern diode. They really don't need matching because the modern diodes are so much more uniform in manufacture. If you have a DMM with a Diode Test function, you can select four with similar forward junction voltages. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com George Cortez Jr wrote: George Cortez Jr [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi all Does anyone have a T14 from a junker T4X? Thanks George NE2I -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X transformer 14
George Cortez Jr [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi all Does anyone have a T14 from a junker T4X? Thanks George NE2I -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Problem - HELP!
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim - OK. You can use a 6AU6 or 6AH6 in place of the 6HS6, certainly for test purposes. Most transmitters will also put out power with the Bandswitch on 20M and the RF Tune (I knew what you meant!) in the 40M range. This is the second harmonic of the 5.645 MHz Carrier Oscillator. You should see about 3V p-p on the plate of V8 at 12.645 MHz. Also, don't forget that there are a LOT of bandswitch contacts involved in these paths, so a careful inspection and treatment with DeoxIT _liquid_ applied to the contacts is a good place to start. Let us know! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Jim Gerke wrote: Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- Gary, I need to go back and check the P-P voltage on the oscillator and PTO, but they were both definitely working. I haven't tried changing the pre-mixer tube yet, in part because the only other 6HS6 I have is installed in a T4X-B that I'll have to open up. I haven't been able to do any more troubleshooting since my post, but tomorrow will check to see if both signals are making it to the pre-mixer stage, and what, if anything, is coming out. Just to be clear, there is no power output on any band at any preselctor setting, other than with the bandswitch on 40m and the RF Tune (I said preselector by mistake in my post) in the 80m range. It has to be something common to all bands and the pre-mixer or mixer are certainly good candidates. I'll let you know what I find. Thanks. 73, Jim K5JG Garey Barrell wrote: Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim - If you are getting a preselector peak with the Bandswitch on 40M ONLY on the 80M range, what is happening is that you are tuning the transmitter Preselector to the Carrier Oscillator frequency of 5.645 MHz. This indicates that one of THREE circuits are not working correctly. 1. The PTO is not running between 4.955 and 5.455 MHz. (5.455 MHz with dial set to 0.0) 2. The Band oscillator is not running at 18.1 MHz 3. The Premixer where #1 and #2 above are combined into 12.645 MHz Since you say you have 1 2 verified (both should be about 2 V p-p) then either the 12.645 MHz signal is not being developed in the Premixer stage, or if it is, it's not getting to the Mixer stage where it is mixed with the 5.645 MHz Carrier oscillator to output 7.0 MHz. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Jim Gerke wrote: Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- I have a T-4X that was working fine until yesterday afternoon when it started keying itself, unkeying, etc., etc. It finally stopped, but then it would no longer transmit. I changed the electrolytic caps in accordance with info from various websites and it started working again. So far so good. Then, I decided to check out a couple of spare sets of Sylvania finals to see what they were like. Put in the first set and they worked, a little weak, but ok. When removing the cage to pull them and put in the next set, I shorted the cage to one of the variable caps and SNAP! I'd forgotten to disconnect the PS connector from the transmitter. At least the PS was turned off at the time. Since then, radio won't TX properly with any tubes installed, even known good (100W-125W) ones. I can get output (25W or) only with the bandswitch set to 40m and the preselector in the 80m range, but's it's definitely not transmitting on 40m. I'd had this problem once before, but in that case, the T-4X eventually decided to work again on its own. This time, so far, it hasn't come back. Final HV measures OK. Haven't measured the bias voltage, but I do have proper bias indication on the meter. I have verified that the crystal oscillator and the PTO are working using a 'scope. Same symptoms using two different AC4 power supplies. I'm still troubleshooting, but any suggestions that might speed up the process would be appreciated. 73, Jim K5JG -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Problem - HELP!
Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- Gary, I swapped the two 6AU6's (V3 V11) and the transmitter started working. Swapped them back and it quit. Using another 6AU6 I quickly determined that the 6AU6 at V3 (Mixer) was bad. I probably shouldn't admit to this on this reflector, but the tube that now resides at V3 is imprinted with the name (gasp!) Hallicrafters! (borrowed from the 100KHz crystal calibrator in my SX-111 receiver) The transmitter now seems solid again, knock on wood. Thanks for your help. 73, Jim K5JG Garey Barrell wrote: Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim - OK. You can use a 6AU6 or 6AH6 in place of the 6HS6, certainly for test purposes. Most transmitters will also put out power with the Bandswitch on 20M and the RF Tune (I knew what you meant!) in the 40M range. This is the second harmonic of the 5.645 MHz Carrier Oscillator. You should see about 3V p-p on the plate of V8 at 12.645 MHz. Also, don't forget that there are a LOT of bandswitch contacts involved in these paths, so a careful inspection and treatment with DeoxIT _liquid_ applied to the contacts is a good place to start. Let us know! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Jim Gerke wrote: Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- Gary, I need to go back and check the P-P voltage on the oscillator and PTO, but they were both definitely working. I haven't tried changing the pre-mixer tube yet, in part because the only other 6HS6 I have is installed in a T4X-B that I'll have to open up. I haven't been able to do any more troubleshooting since my post, but tomorrow will check to see if both signals are making it to the pre-mixer stage, and what, if anything, is coming out. Just to be clear, there is no power output on any band at any preselctor setting, other than with the bandswitch on 40m and the RF Tune (I said preselector by mistake in my post) in the 80m range. It has to be something common to all bands and the pre-mixer or mixer are certainly good candidates. I'll let you know what I find. Thanks. 73, Jim K5JG Garey Barrell wrote: Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim - If you are getting a preselector peak with the Bandswitch on 40M ONLY on the 80M range, what is happening is that you are tuning the transmitter Preselector to the Carrier Oscillator frequency of 5.645 MHz. This indicates that one of THREE circuits are not working correctly. 1. The PTO is not running between 4.955 and 5.455 MHz. (5.455 MHz with dial set to 0.0) 2. The Band oscillator is not running at 18.1 MHz 3. The Premixer where #1 and #2 above are combined into 12.645 MHz Since you say you have 1 2 verified (both should be about 2 V p-p) then either the 12.645 MHz signal is not being developed in the Premixer stage, or if it is, it's not getting to the Mixer stage where it is mixed with the 5.645 MHz Carrier oscillator to output 7.0 MHz. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Jim Gerke wrote: Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- I have a T-4X that was working fine until yesterday afternoon when it started keying itself, unkeying, etc., etc. It finally stopped, but then it would no longer transmit. I changed the electrolytic caps in accordance with info from various websites and it started working again. So far so good. Then, I decided to check out a couple of spare sets of Sylvania finals to see what they were like. Put in the first set and they worked, a little weak, but ok. When removing the cage to pull them and put in the next set, I shorted the cage to one of the variable caps and SNAP! I'd forgotten to disconnect the PS connector from the transmitter. At least the PS was turned off at the time. Since then, radio won't TX properly with any tubes installed, even known good (100W-125W) ones. I can get output (25W or) only with the bandswitch set to 40m and the preselector in the 80m range, but's it's definitely not transmitting on 40m. I'd had this problem once before, but in that case, the T-4X eventually decided to work again on its own. This time, so far, it hasn't come back. Final HV measures OK. Haven't measured the bias voltage, but I do have proper bias indication on the meter. I have verified that the crystal oscillator and the PTO are working using a 'scope. Same symptoms using two different AC4 power supplies.
[drakelist] T4X Problem - HELP!
Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- I have a T-4X that was working fine until yesterday afternoon when it started keying itself, unkeying, etc., etc. It finally stopped, but then it would no longer transmit. I changed the electrolytic caps in accordance with info from various websites and it started working again. So far so good. Then, I decided to check out a couple of spare sets of Sylvania finals to see what they were like. Put in the first set and they worked, a little weak, but ok. When removing the cage to pull them and put in the next set, I shorted the cage to one of the variable caps and SNAP! I'd forgotten to disconnect the PS connector from the transmitter. At least the PS was turned off at the time. Since then, radio won't TX properly with any tubes installed, even known good (100W-125W) ones. I can get output (25W or) only with the bandswitch set to 40m and the preselector in the 80m range, but's it's definitely not transmitting on 40m. I'd had this problem once before, but in that case, the T-4X eventually decided to work again on its own. This time, so far, it hasn't come back. Final HV measures OK. Haven't measured the bias voltage, but I do have proper bias indication on the meter. I have verified that the crystal oscillator and the PTO are working using a 'scope. Same symptoms using two different AC4 power supplies. I'm still troubleshooting, but any suggestions that might speed up the process would be appreciated. 73, Jim K5JG -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Problem - HELP!
Gary Poland [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim, If your getting plate current on 40 meters with the preselector set in the 80 meter range your crystal oscillator has quit or something is screwy ( is that a word ? ) with your accy crystal switch. 73, Gary -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Problem - HELP!
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim - If you are getting a preselector peak with the Bandswitch on 40M ONLY on the 80M range, what is happening is that you are tuning the transmitter Preselector to the Carrier Oscillator frequency of 5.645 MHz. This indicates that one of THREE circuits are not working correctly. 1. The PTO is not running between 4.955 and 5.455 MHz. (5.455 MHz with dial set to 0.0) 2. The Band oscillator is not running at 18.1 MHz 3. The Premixer where #1 and #2 above are combined into 12.645 MHz Since you say you have 1 2 verified (both should be about 2 V p-p) then either the 12.645 MHz signal is not being developed in the Premixer stage, or if it is, it's not getting to the Mixer stage where it is mixed with the 5.645 MHz Carrier oscillator to output 7.0 MHz. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Jim Gerke wrote: Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- I have a T-4X that was working fine until yesterday afternoon when it started keying itself, unkeying, etc., etc. It finally stopped, but then it would no longer transmit. I changed the electrolytic caps in accordance with info from various websites and it started working again. So far so good. Then, I decided to check out a couple of spare sets of Sylvania finals to see what they were like. Put in the first set and they worked, a little weak, but ok. When removing the cage to pull them and put in the next set, I shorted the cage to one of the variable caps and SNAP! I'd forgotten to disconnect the PS connector from the transmitter. At least the PS was turned off at the time. Since then, radio won't TX properly with any tubes installed, even known good (100W-125W) ones. I can get output (25W or) only with the bandswitch set to 40m and the preselector in the 80m range, but's it's definitely not transmitting on 40m. I'd had this problem once before, but in that case, the T-4X eventually decided to work again on its own. This time, so far, it hasn't come back. Final HV measures OK. Haven't measured the bias voltage, but I do have proper bias indication on the meter. I have verified that the crystal oscillator and the PTO are working using a 'scope. Same symptoms using two different AC4 power supplies. I'm still troubleshooting, but any suggestions that might speed up the process would be appreciated. 73, Jim K5JG -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Problem - HELP!
Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- Gary, I need to go back and check the P-P voltage on the oscillator and PTO, but they were both definitely working. I haven't tried changing the pre-mixer tube yet, in part because the only other 6HS6 I have is installed in a T4X-B that I'll have to open up. I haven't been able to do any more troubleshooting since my post, but tomorrow will check to see if both signals are making it to the pre-mixer stage, and what, if anything, is coming out. Just to be clear, there is no power output on any band at any preselctor setting, other than with the bandswitch on 40m and the RF Tune (I said preselector by mistake in my post) in the 80m range. It has to be something common to all bands and the pre-mixer or mixer are certainly good candidates. I'll let you know what I find. Thanks. 73, Jim K5JG Garey Barrell wrote: Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Jim - If you are getting a preselector peak with the Bandswitch on 40M ONLY on the 80M range, what is happening is that you are tuning the transmitter Preselector to the Carrier Oscillator frequency of 5.645 MHz. This indicates that one of THREE circuits are not working correctly. 1. The PTO is not running between 4.955 and 5.455 MHz. (5.455 MHz with dial set to 0.0) 2. The Band oscillator is not running at 18.1 MHz 3. The Premixer where #1 and #2 above are combined into 12.645 MHz Since you say you have 1 2 verified (both should be about 2 V p-p) then either the 12.645 MHz signal is not being developed in the Premixer stage, or if it is, it's not getting to the Mixer stage where it is mixed with the 5.645 MHz Carrier oscillator to output 7.0 MHz. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line TR-4/C Service Supplement CDs www.k4oah.com Jim Gerke wrote: Jim Gerke [EMAIL PROTECTED] made an utterance to the drakelist gang -- I have a T-4X that was working fine until yesterday afternoon when it started keying itself, unkeying, etc., etc. It finally stopped, but then it would no longer transmit. I changed the electrolytic caps in accordance with info from various websites and it started working again. So far so good. Then, I decided to check out a couple of spare sets of Sylvania finals to see what they were like. Put in the first set and they worked, a little weak, but ok. When removing the cage to pull them and put in the next set, I shorted the cage to one of the variable caps and SNAP! I'd forgotten to disconnect the PS connector from the transmitter. At least the PS was turned off at the time. Since then, radio won't TX properly with any tubes installed, even known good (100W-125W) ones. I can get output (25W or) only with the bandswitch set to 40m and the preselector in the 80m range, but's it's definitely not transmitting on 40m. I'd had this problem once before, but in that case, the T-4X eventually decided to work again on its own. This time, so far, it hasn't come back. Final HV measures OK. Haven't measured the bias voltage, but I do have proper bias indication on the meter. I have verified that the crystal oscillator and the PTO are working using a 'scope. Same symptoms using two different AC4 power supplies. I'm still troubleshooting, but any suggestions that might speed up the process would be appreciated. 73, Jim K5JG -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] t4x
Hello again to all, I have to say you guys know your stuff out there, I found the t4x needed some alignment and it cured my brassy or trebly sounding audio.. Now the next problem I just had. After turning the t4x on and off a few times, it is now stuck on. seems the on off switch is stuck on. Is this hard to replace and are they available?? tnx and 73 Bill
Re: [drakelist] T4X Final RF Tubes
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy - Nope, no cigar... NO modifications are needed to either the T-4(any) or the TR-4(any) to use the 6GJ5s. Pin 3 in the Drake 4 Line transmitters is the cathode of the final tubes. Pin 8 in the transmitters is grounded at the socket. With 6JB6s, K is connected internally to Pin 3, and G3 is connected internally to Pin 8. With 6GJ5s, K AND G3 are connected internally to Pin 3, AND there is _NO_ connection to Pin 8. So everything works the same, except G3 is connected directly to K rather than via a 15 ohm and 3.3 ohm resistor. The only difference is the interelectrode capacitance, which is small enough (0.5 pF) that the neutralization circuit is able to take care of it. NOTE: RCA Tube Manual for Class A Operation states G3 connected to cathode at socket. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com EP Swynar wrote: EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sunday 20th January, Garey wrote... ...True, the G3 is brought out to Pin 8 in the 6JB6, and that socket pin IS grounded in the T-4... However, in the 6GJ5 G3 is brought internally to the cathode Pin _3_. There is NO connection to Pin 8 in the 6GJ5. Simple!... *** Hi Garey, I think I'm beginning to understand all this, at last...! What's been missing all along here, is the mandatory execution --- right from the get-go --- of TWO crucial operations, i.e.: (1) The wire from pin #8 to chassis ground at the final amplifier sockets in the T4X must first be snipped, and, (2) A new wire has to be added, jumpering pin #3 to pin #8 at both sockets. What will be accomplished thusly is the following: (1) The pin #3 cathode break-out of the 6GJ5 will now effectively be at the pin #8-cum-pin #3 of the T4X socket, and, (2) For better or worse, the suppressor grids of the 6GJ5 tubes will be at the exact same potential as the cathodes (NOTE: is that an especially good --- or bad --- thing?). Failure to first execute the ...nip tuck at the sockets will leave the current meter reading zero all the time, and the finals will be on constantly...correct? I wonder if it wouldn't be simpler to just re-wire the filaments for 12.6 VAC, a pair of 12JB6's, Hi Hi! ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi Garey, ...At long last, the clouds (in my mind) are beginning to part, I believe I can see the light, at long last...! You'd never know that I'm a college graduate, would you...?! Hi Hi Thanks for the info...I'll be watching for those bottles at the next Hamfest that I might attend here... ~73!~ Eddy VE3CUI - VE3XZ *** - Original Message - From: Garey Barrell [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Monday, January 21, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy - Nope, no cigar... NO modifications are needed to either the T-4(any) or the TR-4(any) to use the 6GJ5s. Pin 3 in the Drake 4 Line transmitters is the cathode of the final tubes. Pin 8 in the transmitters is grounded at the socket. With 6JB6s, K is connected internally to Pin 3, and G3 is connected internally to Pin 8. With 6GJ5s, K AND G3 are connected internally to Pin 3, AND there is _NO_ connection to Pin 8. So everything works the same, except G3 is connected directly to K rather than via a 15 ohm and 3.3 ohm resistor. The only difference is the interelectrode capacitance, which is small enough (0.5 pF) that the neutralization circuit is able to take care of it. NOTE: RCA Tube Manual for Class A Operation states G3 connected to cathode at socket. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com EP Swynar wrote: EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sunday 20th January, Garey wrote... ...True, the G3 is brought out to Pin 8 in the 6JB6, and that socket pin IS grounded in the T-4... However, in the 6GJ5 G3 is brought internally to the cathode Pin _3_. There is NO connection to Pin 8 in the 6GJ5. Simple!... *** Hi Garey, I think I'm beginning to understand all this, at last...! What's been missing all along here, is the mandatory execution --- right from the get-go --- of TWO crucial operations, i.e.: (1) The wire from pin #8 to chassis ground at the final amplifier sockets in the T4X must first be snipped, and, (2) A new wire has to be added, jumpering pin #3 to pin #8 at both sockets. What will be accomplished thusly is the following: (1) The pin #3 cathode break-out of the 6GJ5 will now effectively be at the pin #8-cum-pin #3 of the T4X socket, and, (2) For better or worse, the suppressor grids of the 6GJ5 tubes will be at the exact same potential as the cathodes (NOTE: is that an especially good --- or bad --- thing?). Failure to first execute the ...nip tuck at the sockets will leave the current meter reading zero all the time, and the finals will be on constantly...correct? I wonder if it wouldn't be simpler to just re-wire the filaments for 12.6 VAC, a pair of 12JB6's, Hi Hi! ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X Final RF Tubes
Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the stock 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to normal at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF cage of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ
Re: [drakelist] T4X Final RF Tubes
john [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy Take a look at 6GJ5s ! John K5MO At 08:32 AM 1/20/2008, you wrote: Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the stock 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to normal at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF cage of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: john [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes john [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy Take a look at 6GJ5s ! John K5MO At 08:32 AM 1/20/2008, you wrote: Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the stock 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to normal at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF cage of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: john [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes john [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy Take a look at 6GJ5s ! John K5MO At 08:32 AM 1/20/2008, you wrote: Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the stock 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to normal at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF cage of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: john [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes john [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy Take a look at 6GJ5s ! John K5MO At 08:32 AM 1/20/2008, you wrote: Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the stock 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to normal at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF cage of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: john [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes john [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy Take a look at 6GJ5s ! John K5MO At 08:32 AM 1/20/2008, you wrote: Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the stock 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to normal at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF cage of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
john [EMAIL PROTECTED] made an utterance to the drakelist gang -- Exactly, but Drake does that at the socket, so no diff! JB At 09:26 AM 1/20/2008, you wrote: EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi John, Without a base diagram of the 6GJ5 directly in front of me --- and correct me if I'm wrong! --- isn't the suppressor grid connected directly to the cathode inside of that particular tube...? ~73~ Eddy VE3CUI - VE3XZ ** - Original Message - From: john [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Sunday, January 20, 2008 9:15 AM Subject: Re: [drakelist] T4X Final RF Tubes john [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy Take a look at 6GJ5s ! John K5MO At 08:32 AM 1/20/2008, you wrote: Good Morning All, I'm curious as to the results anyone may have had by substituting 12JB6 tubes in place of the stock 6JB6 bottles in their T4X transmitters... Glancing at the filament wiring in the schematic, such a transformation certainly looks like it'd be easy enough to execute, relatively harmless, AND simple to return the rig back to normal at any future time, should the need arise. I thought I was SO smart here, by convincing myself that a pair of my spare 6LQ6's would be a rugged, rough ready primo substitute for a 6JB6 --- until I saw the comparative physical heights between the two, AND took a peek inside the tight quarters of the RF cage of my T4X, that is! Hi Hi ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Eddy - The cathode is almost grounded at the socket by a 470 pF cap, (a little feedback for linearization,) then through the 15 ohm cathode resistor to equalize the current between the tubes, and then RF Ground by a 0.005 uF cap. Then it's off through an RF choke for keying and cathode current monitoring, etc., essentially a 3.3 ohm resistor to DC ground. In the T-4(any), G3 is DC grounded at the socket, but in the TR-4(any), G3 is bypassed to the bottom of the 15 ohm cathode resistors. Bottom line is, the 6GJ5 works just fine in the T/TR-4(any) with the same caveats as the 6JB6, i.e., not ALL brands work well. The same reliable brands, (Sylvania, Zenith, RCA and GE ALWAYS work,) Westinghouse, Raytheon, Standard and a few of the late term rebranders sometimes work. The tube was designed to work at ~16kHz, and only Sylvania actually characterized and published data for use in linear service at 2-30 MHz. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com EP Swynar wrote: EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- Hi Again John, Interesting...! I can't honestly say that I've had the bottom cover off of my ...new/old T4X here yet, but the schematic in the manual, at least, definitely shows that pin #8 (suppressor grid) of each tube is directly grounded, whilst pin #3 for each is connected to resistors, capacitors, etc., i.e. NO direct ground connection... This merits further investigation on the part of yours truly, Hi. ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X Final RF Tubes
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Close, but not quite. True, the G3 is brought out to Pin 8 in the 6JB6, and that socket pin IS grounded in the T-4 However, in the 6GJ5 G3 is brought internally to the cathode Pin _3_. There is NO connection to Pin 8 in the 6GJ5. Simple! :-) The tube manuals all say Pin 8 is IC for Internal Connection, but after looking at many 6GJ5s of various brands, I have yet to find one with anything connected to Pin 8. There may be one, but so far 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com EP Swynar wrote: EP Swynar [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sunday 20th January, Garey wrote... ...Bottom line is, the 6GJ5 works just fine in the T/TR-4(any) with the same caveats as the 6JB6, i.e., not ALL brands work well... *** Hi Garey, Many thanks for that FB note... However, I must say, I still remain skeptical and confused (both!) by the notion of employing a 6GJ5 tube as a direct replacement for the 6JB6 in the T4X transmitter... Specifically, because pin #8 in the rig is directly connected to ground, and in the 6GJ5 the suppressor grid is connected directly to the cathode internally AND both the cathode suppressor come out at pin #8 in that tube, wouldn't you effectively have the finals in constant key down mode with the substitutes plugged in...? As well, you'd have no cathode/plate current meter readings, either --- correct? What have I missed here...? I dearly DO want to be a believer, but there must be some Missourian doubting Thomas deep within me! Hi Hi. That, or my proverbial enquiring mind just NEEDS to know... ~73~ Eddy VE3CUI - VE3XZ -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] t4x nd t4xb lsb filter?
are the filters the same on the t4x and xb? Carey Lockhart, KC5GTT [EMAIL PROTECTED] www.kc5gtt.com
Re: [drakelist] t4x nd t4xb lsb filter?
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- No. The T-4X has four pole filters, the T-4XB has eight pole filters. I believe they are the same impedance in and out (2K?) but perhaps someone else knows better. The eight pole filters would be considerably higher insertion loss than the four pole units, so the gain would have to be made up somewhere, probably in the IF Amp stage. So it may be able to substitute one for the other, but it would have to be in pairs, and the gain would have to be increased. Let us know what you find out if you pursue! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com Carey Lockhart wrote: are the filters the same on the t4x and xb? Carey Lockhart, KC5GTT [EMAIL PROTECTED] mailto:[EMAIL PROTECTED] www.kc5gtt.com -- Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X tuneup
Garey Barrell [EMAIL PROTECTED] made an utterance to the drakelist gang -- Terry - A couple of things. 1. The recommended idle current for the T-4X(any) is 0.100A rather than 0.07A. 2. Some key jacks on early models were not of the shorting type, i.e., shorted with no key plug inserted. In a transmitter that hasn't been used for a while, the contacts on the shorting jacks don't always make contact until they have been exercised by inserting and removing a plug a time or two. IF a key is plugged in, close it when tuning up. Later transmitters shorted the key line in the TUNE mode, eliminating the key jack question. If you have the twins cabled together for transceive, try switching the TRANSCEIVE control to XMTR. With both units on the same band, preselectors peaked, etc., can you tune the receiver with the transmitter PTO? If so, you have confirmed about 95% of the transmitter circuits. If not, ensure that the XTALS switch is in the NORM position. If still nothing, try another band. If STILL nothing, switch to RCVR control and try the TUNE mode again. If you get Plate current under receiver control, you have a BAND oscillator, PTO or Premixer problem in the transmitter. Let us know! 73, Garey - K4OAH Richmond Drake 2-B, 4-B C-Line Service Supplement CDs www.k4oah.com Terry Hamilton wrote: Greetings, all! I am now the proud new owner of a set of 4B line twins, which I have coveted since the late ‘60’s. I’ve been trying to tune up the T4X, but can’t get any significant change in plate amperage. I am probably making a simple mistake in following the directions, and don’t want to damage the unit, go I thought I’d put this out there to the experts. I began by adjusting the bias supply to .07 amps. Then I followed the preset controls checklist on p. 14 of the manual. I then put the function switch into the tune position, advanced the gain control and adjusted the RF tune control to try to get the plate current up to .15 amps as the manual directs. However, the plate current doesn’t budge from the .07 amp reading. Is it time for new tubes, or am I missing something? 73 Terry Hamilton K7WLD -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X tuning issue
RWP [EMAIL PROTECTED] made an utterance to the drakelist gang -- Ouch. Those poor ole 6JB6's. What does the output look like? Good Luck my friend. 73, Wayne W4RXN Proud Drake user - Original Message - From: Wayne Heil [EMAIL PROTECTED] To: drakelist@www.zerobeat.net Sent: Monday, March 12, 2007 2:01 PM Subject: [drakelist] T4X tuning issue Wayne Heil [EMAIL PROTECTED] made an utterance to the drakelist gang -- When I try to tune my T4X and I get to the part where I am supposed to increase the gain until the plate current stops increasing, sometimes the plate current just keeps increasing and won't level out. I am tuning into a dummy load. Any idea's where to start looking. -Wayne, KB6OQJ [EMAIL PROTECTED] -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X tuning issue
Ron Wagner [EMAIL PROTECTED] made an utterance to the drakelist gang -- Wayne, It really sounds like parasitics on the surface. Can you look at the output power level to see that it continues to increase as well? A parasitic will generate output, just not on the correct frequency. Have you checked your neutralization recently? Is your preselector in the right position? It sounds like this only happens once in a while. Is it on all bands, or just higher bands? Are you tuning with the tune position, or are you tuning in CW mode (not recommended by Drake, but will work if you are a CW op)? 73, Ron WD8SBB - Original Message - From: Wayne Heil [EMAIL PROTECTED] To: drakelist@www.zerobeat.net Sent: Monday, March 12, 2007 2:01 PM Subject: [drakelist] T4X tuning issue Wayne Heil [EMAIL PROTECTED] made an utterance to the drakelist gang -- When I try to tune my T4X and I get to the part where I am supposed to increase the gain until the plate current stops increasing, sometimes the plate current just keeps increasing and won't level out. I am tuning into a dummy load. Any idea's where to start looking. -Wayne, KB6OQJ [EMAIL PROTECTED] -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X VOX hangs up?
n0tu/Steve [EMAIL PROTECTED] made an utterance to the drakelist gang -- In CW mode my T4X is hanging up lately! I can't get it to retrun to standby with out turning it off then back on again? VOX delay has no effect and VOX sensitivity and gain controls are acting weird? There's actually a combinations of setting on the VOX Sens Gain controls where if I send a DIT it trips the relay then hangs until I send a DAH then it releases and goes into standb? Huh? I've replaced the 6EV7 and swapped the 12AX7s? any suggestions TKS Steve -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] T4X mic wiring question
Gerry [EMAIL PROTECTED] made an utterance to the drakelist gang -- There is no standard among microphone manufacturers. They sometimes change color codes to suit the lowest priced cord vendor and they also make mistakes. Obviously, they don't go out and buy a sample of every rig made so they take educated guesses and they are sometimes wrong. This is why it's not good to rely on a formulaic approach: green goes here, blue goes there, etc. Far better to look at the function of each wire and then decide. The T-4XC wiring is about the simplest thing there is. Only 2 wires and a ground. Obviously one of the pins is PTT and the other must be the mic. The problem occurs in the variety of microphones and the color codes involved. Opening the mic and looking at the switch functions and the color wires attached reveals all. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Richard Loken Sent: Sunday, July 09, 2006 5:31 PM To: [EMAIL PROTECTED] Cc: drakelist@www.zerobeat.net Subject: Re: [drakelist] T4X mic wiring question Richard Loken [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Tue, 4 Jul 2006 [EMAIL PROTECTED] wrote: Red - tip White - sleeve (middle) black + braid - body From my days at the phone company, should that not be: Red - tip White - ring black + braid - sleeve Am I wrong? -- Richard Loken VE6BSV, Systems Programmer - VMS : Anybody can be a father Athabasca University: but you have to earn Athabasca, Alberta Canada : the title of 'daddy' ** [EMAIL PROTECTED] ** : - Lynn Johnston -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net -- -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] T4X mic wiring question
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Mon, 10 Jul 2006 17:53:39 -0400, Gerry wrote: There is no standard among microphone manufacturers. They sometimes change color codes to suit the lowest priced cord vendor and they also make mistakes. True, but there are certian brands/models of (mostly vintage American made) mics that do follow the red=PTT, white=audio, shield=audio ground, and black=PTT return format. It is best to verify visually or with an ohm-eater though. -- TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all vintage, all the time! -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X mic wiring question
Richard Loken [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Tue, 4 Jul 2006 [EMAIL PROTECTED] wrote: Red - tip White - sleeve (middle) black + braid - body From my days at the phone company, should that not be: Red - tip White - ring black + braid - sleeve Am I wrong? -- Richard Loken VE6BSV, Systems Programmer - VMS : Anybody can be a father Athabasca University: but you have to earn Athabasca, Alberta Canada : the title of 'daddy' ** [EMAIL PROTECTED] ** : - Lynn Johnston -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X mic wiring question
chuck grandgent [EMAIL PROTECTED] made an utterance to the drakelist gang -- Again, I wanted to thank the list for the MANY fine responses. Just wanted to let y'all know I'm off tomorrow on a business trip and won't get back for a couple weeks, so won't get to it until then. Consensus was I have a couple wires swapped. I will report the results back when I get around to it, just wanted to let you all know why the delay. Thanks again, Chuck, K1OM, Alachua FL -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X mic wiring question
[EMAIL PROTECTED] made an utterance to the drakelist gang -- As usual, wiring for mic for my T4X is a mystery for me, I think I have the PTT part wrong maybe. First, I have another mic, a Turner, wired up OK, I use it strictly PTT, not VOX and it works fine. I recently got another mic from Ken, W8EK Drake banana desk microphone This is the 2 piece desk microphone that was used on the TR-3 and TR-4 and the 4 line twins. It has a separate stand, and can be lifted out of the stand, or left in it. These micro- phones are high impedance, and were made by ElectroVoice for Drake. This one is labeled EV 729 SR D on the microphone portion, while the base is an EV 417. My scope shows it does have good output, better than my Turner (with built-in amp) actually. Having trouble making the wiring happy. T4X manual sez: connections to plug are: tip - push to talk switch, sleeve is microphone, body is common for both. When it says sleeve, I'm assuming that's the part wired between the tip and the back / ground part of the plug (in the middle of the plug) ? The cable for the mic I got from Ken has white, red, black, and braid. I had thought tip would be white, red would be body / back, black would be middle / sleeve. Not behaving correctly however. How should I have it ? I seem to remember something about making a choice between VOX and PTT. Is there some way to be able to do either ? If I have to, I guess my preference is PTT. I also seem to remember that with one of the setups, when I go back to CW I have to screw around with the VOX gain or something... Thanks, Chuck, K1OM drakelist@www.zerobeat.net -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
RE: [drakelist] T4X mic wiring question
Ken Simpson, W8EK [EMAIL PROTECTED] made an utterance to the drakelist gang -- Do you have the ground braid to the ground of the plug? The Hot of the audio goes to the sleeve of the plug, and the hot of the PTT goes to the tip. The cold of the PTT also connects to the ground of the plug, along with the shield. Sorry, but I do not remember for sure what color wire is what. My MEMORY says that red is PTT hot (tip), white is audio hot (sleeve), and black and braid go to ground. But this is memory, and might not be correct as to the colors. It is wired this way whether for PTT or VOX. 73, Ken, W8EK -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Sunday, June 11, 2006 11:46 AM To: drakelist@www.zerobeat.net Subject: [drakelist] T4X mic wiring question [EMAIL PROTECTED] made an utterance to the drakelist gang --- As usual, wiring for mic for my T4X is a mystery for me, I think I have the PTT part wrong maybe. First, I have another mic, a Turner, wired up OK, I use it strictly PTT, not VOX and it works fine. I recently got another mic from Ken, W8EK Drake banana desk microphone This is the 2 piece desk microphone that was used on the TR-3 and TR-4 and the 4 line twins. It has a separate stand, and can be lifted out of the stand, or left in it. These micro- phones are high impedance, and were made by ElectroVoice for Drake. This one is labeled EV 729 SR D on the microphone portion, while the base is an EV 417. My scope shows it does have good output, better than my Turner (with built-in amp) actually. Having trouble making the wiring happy. T4X manual sez: connections to plug are: tip - push to talk switch, sleeve is microphone, body is common for both. When it says sleeve, I'm assuming that's the part wired between the tip and the back / ground part of the plug (in the middle of the plug) ? The cable for the mic I got from Ken has white, red, black, and braid. I had thought tip would be white, red would be body / back, black would be middle / sleeve. Not behaving correctly however. How should I have it ? I seem to remember something about making a choice between VOX and PTT. Is there some way to be able to do either ? If I have to, I guess my preference is PTT. I also seem to remember that with one of the setups, when I go back to CW I have to screw around with the VOX gain or something... Thanks, Chuck, K1OM drakelist@www.zerobeat.net -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X mic wiring question
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sun, 11 Jun 2006 11:46:01 -0400, [EMAIL PROTECTED] wrote: T4X manual sez: connections to plug are: tip - push to talk switch, sleeve is microphone, body is common for both. When it says sleeve, I'm assuming that's the part wired between the tip and the back / ground part of the plug (in the middle of the plug) ? Correct. Also referred to as ring. The cable for the mic I got from Ken has white, red, black, and braid. I had thought tip would be white, red would be body / back, black would be middle / sleeve. The standard color code for mics of this type is white=audio, red=PTT, black=PTT return (ground), braid=audio return (shield). (Side note: mics intended for the CB market tended to vary widely from this standard). Try it like so: white - tip red - sleeve black and braid - body Report back with your reults. 73 -Jim -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X mic wiring question
Chuck, Got a VOM or DVM ? Put the VOM in continuity or ohms position andacross the 2 conductors you think are PTT. Closure of the PTT switch should show zero ohms or continuity. My best GUESS. WHITEis your microphone element (audio) SHIELD/BRAID is the audio ground RED / BLACK are the PTT lines TEST IT w9gb - Original Message - From: [EMAIL PROTECTED] To: drakelist@www.zerobeat.net Sent: Sunday, June 11, 2006 10:46 AM Subject: [drakelist] T4X mic wiring question [EMAIL PROTECTED] made an utterance to the drakelist gang -- As usual, wiring for mic for my T4X is a mystery for me, I think I have the PTT part wrong maybe. First, I have another mic, a Turner, wired up OK, I use it strictly PTT, not VOX and it works fine. I recently got another mic from Ken, W8EK Drake "banana" desk microphone This is the 2 piece desk microphone that was used on the TR-3 and TR-4 and the 4 line twins. It has a separate stand, and can be lifted out of the stand, or left in it. These micro- phones are high impedance, and were made by ElectroVoice for Drake. This one is labeled EV 729 SR D on the microphone portion, while the base is an EV 417. My scope shows it does have good output, better than my Turner (with built-in amp) actually. Having trouble making the wiring happy. T4X manual sez: "connections to plug are: tip - push to talk switch, sleeve is microphone, body is common for both". When it says "sleeve", I'm assuming that's the part wired between the tip and the back / ground part of the plug (in the middle of the plug) ? The cable for the mic I got from Ken has white, red, black, and braid. I had thought tip would be white, red would be body / back, black would be middle / "sleeve". Not behaving correctly however. How should I have it ? I seem to remember something about making a choice between VOX and PTT. Is there some way to be able to do either ? If I have to, I guess my preference is PTT. I also seem to remember that with one of the setups, when I go back to CW I have to screw around with the VOX gain or something... Thanks, Chuck, K1OM drakelist@www.zerobeat.net-- Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X mic wiring question
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sun, 11 Jun 2006 11:46:01 -0400, [EMAIL PROTECTED] wrote: I seem to remember something about making a choice between VOX and PTT. Is there some way to be able to do either ? If I have to, I guess my preference is PTT. Missed this one... IIRC, all you need for VOX is for the mic element to be hot all the time. This may or may not be the case with your mic. If mic audio is routed through the PTT switch, you would need to jump it over so the mic is hot all the time. A quick test once you have the mic wired correctly should tell you which way it is wired internally, VOX will either work or it won't. 73 -Jim -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X mic wiring question
Jim Shorney [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Sun, 11 Jun 2006 13:46:09 -0500 (CDT), Jim Shorney wrote: Try it like so: white - tip red - sleeve black and braid - body Yikes, I blew that one. Misread the part about what the manual said. Of course, white should go to sleeve and red to tip. Sorry about that, chief... -- Jim Shorney --.--Put complaints in this box jshorney (at) inebraska.com Ham Radio NU0C Lincoln, NE, USA EN10ps http://incolor.inetnebr.com/jshorney/ -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
Re: [drakelist] T4X-C Sidetone [FOLLOW-UP]
Doug Smith [EMAIL PROTECTED] made an utterance to the drakelist gang -- On Fri, 2005-11-04 at 11:42, Doug Smith wrote: find that the CW sidetone is more or less continuous and really weak and kinda watery sounding. Just following up here.. I replaced C107 with a 250VDC 47mfd electrolytic capacitor. Actually, I left C107 physically in place as it's a dual capacitor in a can and is mounted on the chassis. I didn't look to see what the other capacitor in the can is connected to. Time was short, I was installing the new cap about an hour before the CW Sweepstakes contest started Saturday. I'm going to look for a can replacement for a long term solution. Or maybe replace the other half but leave the can in place for cosmetic reasons. There is room under the chassis for the two new components. Meantime, the sidetone is now great! I just spent 24 hours listening to it during the contest. BTW, my antenna makes me a non-contender (going to have to build an amp) but the Drake C-line performed admirably! Man-0-man, I love this gear!! 73, -Doug, W7KF -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X-C Sidetone
Doug Smith [EMAIL PROTECTED] made an utterance to the drakelist gang -- To celebrate my 40th year as a ham I thought I'd dust off the R4-C / T4X-C and enter the CW Sweepstakes this year. The vintage of the gear seems to match well with the vintage of the license and, to a lesser extent, the licensee.. Anyway, I fired the rig up last night and find that the CW sidetone is more or less continuous and really weak and kinda watery sounding. I have in mind replacing C-129 but that requires a trip to the local electronics shop. Should I pick up anything else during that trip? I mean, are there any other components that might be weak that I ought to consider grabbing while I'm in town? Of course, the lesson here is to test one's rig more than one day before the big contest! Heh. Whoever said wisdom comes with age obviously wasn't old enough to know better.. 73, -Doug, W7KF -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X-C sidetone
Andy Bullington [EMAIL PROTECTED] made an utterance to the drakelist gang -- While we're on the subject, is there any way to lower the pitch of the sidetone? I've grown used to a 600 hz sidetone and the high pitched sidetone of my Drake twins drives me nuts. Too bad because my T4XB produces the best sounding CW note in my station. Andy W1AWB -- Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net --
[drakelist] T4X progress
chuck grandgent [EMAIL PROTECTED] made an utterance to the drakelist gang -- Well thanks to Garey K4OAH and Jay Af2C, I've made some progress getting my T4X back to health (long story, but I bought it and an R4A a few years ago, and havent been able to spend much time on them til now). I found my adjustable 100 ohm 225 watt resistor, got it set for 50 ohms, hooked that up to the alternate connector on my MN4, and also worked with the injector trimmers in the T4X. Current status: 80M, 40M, my MN4 now reports 120 watts or so output on 15M I get maybe 80 watts output. Some good QSOs, with good signal reports. 160M, 20M, 10M, nothing, nada, and adjusting the injection trimmers gives no joy. All crystals seem to be present and accounted for. On these bands not hint of a signal in the receivers. Any obvious things to check ? Thanks much, Chuck, K1OM -- On Behalf of chuck grandgent [EMAIL PROTECTED] Submissions:drakelist@www.zerobeat.net Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] T4X wanted
[EMAIL PROTECTED] made an utterence to the drakelist gang -- Hi Im looking for a descent T4x to go with my R4A Dosent need to be perfect Just descent. Tired of the Ebay game. Thanks George NE2I -- On Behalf of [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] T4X wanted
Garey Barrell [EMAIL PROTECTED] made an utterence to the drakelist gang -- George - You might want to consider getting a T-4XB instead, especially if you plan to use it on SSB. Functionally, the T-4X is identical to the B and C versions. Only con about the T-4X is that it has 4 pole SB filters rather than the 8 pole versions used in the B and C versions. They do generate some junk on the opposite sideband and close to the carrier. This should not necessarily be a deal breaker, but it does mean slightly lower carrier suppression and more spurious junk around an SSB signal. It would not be very neighborly to drive a linear amplifier with it. The X is spec'd at 40 dB above 750 Hz while the B and C are spec'd at 60 dB for sideband suppression. This is of no concern for CW. From the front panel, the only difference is that the B has fewer calibration marks on the main tuning dial, black overprinting on the above the belt lettering, (making it readable!,), and slightly different main tuning knob. Personally I would hold out for a B version. 73, Garey - K4OAH Atlanta [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] made an utterence to the drakelist gang -- Hi Im looking for a descent T4x to go with my R4A Dosent need to be perfect Just descent. Tired of the Ebay game. Thanks George NE2I -- On Behalf of Garey Barrell [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] T4X wanted
Garey Barrell [EMAIL PROTECTED] made an utterence to the drakelist gang -- George - No, it doesn't affect AM either, since you are just generating a carrier and screen modulating it. So the filters aren't really in the circuit at all for AM. The TR-3 and the early TR-4's (the ones with the soupcan filters) have the same problem. Again, it's not like you're going to be transmitting both sidebands or splattering up and down the band, but they certainly wouldn't meet today's spurious emissions limits. Or even last years limits! :-) 73, Garey - K4OAH Atlanta [EMAIL PROTECTED] wrote: Garey, Thanks for the T4x info. I own a T4x and never knew the differences. Does it also affect AM? Thanks in advance, George KB2Z At 04:04 PM 6/12/04 -0400, you wrote: Garey Barrell [EMAIL PROTECTED] made an utterence to the drakelist gang -- George - You might want to consider getting a T-4XB instead, especially if you plan to use it on SSB. Functionally, the T-4X is identical to the B and C versions. Only con about the T-4X is that it has 4 pole SB filters rather than the 8 pole versions used in the B and C versions. They do generate some junk on the opposite sideband and close to the carrier. This should not necessarily be a deal breaker, but it does mean slightly lower carrier suppression and more spurious junk around an SSB signal. It would not be very neighborly to drive a linear amplifier with it. The X is spec'd at 40 dB above 750 Hz while the B and C are spec'd at 60 dB for sideband suppression. This is of no concern for CW. From the front panel, the only difference is that the B has fewer calibration marks on the main tuning dial, black overprinting on the above the belt lettering, (making it readable!,), and slightly different main tuning knob. Personally I would hold out for a B version. 73, Garey - K4OAH Atlanta [EMAIL PROTECTED] wrote: [EMAIL PROTECTED] made an utterence to the drakelist gang -- Hi Im looking for a descent T4x to go with my R4A Dosent need to be perfect Just descent. Tired of the Ebay game. Thanks George NE2I -- On Behalf of Garey Barrell [EMAIL PROTECTED] Submissions:[EMAIL PROTECTED] Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Zerobeat Web Page: http://www.zerobeat.net Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] T4X audio mod...
They are both on Ron's web site. Hey ! Thanks to everybody for the help. What a great list! Actually I guess I should have been a bit more clear with my T4X audio problem. I don't really intend to use the rig on AM. I got the impression from the original post to the list that the audio mod being alluded to would improve the SSB audio. Will the AM mods also make the SSB audio less thin/sharp/tinny? TIA to all y'all...! 73 de Dan -- WØDJW .. Lincoln, Nebraska -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] T4X audio mod...
On Sun, 11 Jan 2004, Daniel Wright wrote: You can still run processed microphone audio directly into the 6AU6 modulator...or you can modify the internal microphone audio path for better low end audio. If interested, email me for details. I am VERY interested and I e-mailed the person (twice) and received no reply. Does anyone else on the list have this info? If anyone does havve it, I can put it up on the website. Thom http://www.baltimorehon.com/Home of the Baltimore Lexicon http://www.tlchost.net/ Web Hosting as low as 3.49/month -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] T4X audio mod...
Greetings!! A while back someone wrote this to the list: You can still run processed microphone audio directly into the 6AU6 modulator...or you can modify the internal microphone audio path for better low end audio. If interested, email me for details. I am VERY interested and I e-mailed the person (twice) and received no reply. Does anyone else on the list have this info? I have a T4X that looks almost new (very shiny copper!) and puts out full power on all bands. The audio reports I get however indicate that it sounds tinny. I have tried various mics, including the 444, but they all seem to garner thin audio reports. It's the same for both USB and LSB by the way. Any B-line xmtr audio hints would be greatly appreciated. Thanks! 73 de Dan -- WØDJW .. Lincoln, Nebraska -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
RE: [drakelist] T4X mod
For two cents, read on You have to seriously consider what you are getting for this mod and why you would do it. There is a reason for controlled carrier in the AM operation of the T4X. It has to do with plate dissipation in the 6JB6's. They are only rated for 17 Watts, and this mod can run you upwards of 25 W in each tube. The elevated temperatures will stress the seals on the leads leaving the envelope, not to mention the screen and plate, and result in shortened tube life in the process. We already have tube life issures and added muffin fans to try and extent life At the current prices and availability of 6JB6's, is it worth it? If you want to play with AM, and it sure is fun to do that, why not just run her through a linear? The linear will be loafing along with maybe 100 W of un-modulated carrier and give loads of headroom. You can still run processed microphone audio directly into the 6AU6 modulator...or you can modify the internal microphone audio path for better low end audio. If interested, email me for details. HI FI audio does not just mean wider bandwidth audio, but better quality of your audio too. The idea is natural sounding audioaway from the compressed monkey sound of SSB. [EMAIL PROTECTED] wrote: Has anyone tried this mod and have any feedback as to performance on both AM and SSB? http://www.amwindow.org/tech/htm/t4.htm Alan KB7MBI in Woodinville, WA FISTS 5702 / ARS / Proud member of ARRL ___ ___ . . . . . . ___ ___ DIT DIT __ New! Unlimited Access from the Netscape Internet Service. Beta test the new Netscape Internet Service for only $1.00 per month until 3/1/04. Sign up today at http://isp.netscape.com/register Act now to get a personalized email address! Netscape. Just the Net You Need. -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
Re: [drakelist] T4X mod
I ran my C-Line on AM unmodified into a Ameritron single 3-500Z amp. I did this for about a year and got very good reports with this setup. Neither the amp nor the T-4XC was overly stressed. 73, Gary -- Submissions:[EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] - subscribe drakelist in body Unsubscribe:[EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost:[EMAIL PROTECTED] - help in body of message Brought to you courtesy of TLCHost.net http://www.tlchost.net/ --
[drakelist] T4X mod
Has anyone tried this mod and have any feedback as to performance on both AM and SSB? http://www.amwindow.org/tech/htm/t4.htm Alan KB7MBI in Woodinville, WAFISTS 5702 / ARS / Proud member of ARRL___ ___ . . . . . . ___ ___ DIT DIT
