[Drakelist] TR-3 Prolems
Drake experts out there, I need help ! TR-3 SN 10892. Rcvr functions fine on all bands. Will not tune up in X-CW position. No plate current, thus no rf out. BFO and mixer appear to work as I can get signal to another receiver on proper freq. Have good rf signal at plate of driver tube on a scope. Have tried new out put tubes. Plate voltage good. Cathode circuit going to ground through antenna relay on X-CW. Screen voltage does not change when going to X-CW In AM position screen voltage is 45 volts. Xtmr gain pot checks ok and have voltage at center tap and it will change. Bias sets up per instruction manual. Any ideas out there ? No plate current, thus no rf out. Sincerely, Boyd W0BUW ___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
[Drakelist] (no subject)
___ Drakelist mailing list Drakelist@zerobeat.net http://mailman.zerobeat.net/mailman/listinfo/drakelist
Re: [drakelist] 2CQ or 2CN
Garey, Thanks, It is a TR-4 not a C. I will take a couple pictures and send to you. Thanks much. Boyd Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Boyd - Well, first of all, that's gotta be a TR-4, not a "C". It would be a Version 2 model. There's always "one" :-) Any chance of a photo of the board? Anything else on that board except the parts you listed? I can make a guess from what you have told me so far... The Red (or White/Red) wire from the PTO should go to the terminal that also has a White/Red wire that is connected (via the harness) to R140, which is shown on Page 14. You should be able to verify that with an ohmmeter check. Also, in this version, you _should_ be able to turn on the transmitter with the PTO out and measure +150V regulated on that terminal. A cross check with the ohmmeter should read very close to 15k ohms from that terminal to the +150V bus. The White/Green wire from the PTO should connect to the terminal that goes to the 100 ohm resistor on your board. The other end of that resistor should go to the coax that goes into the harness, and is the PTO output. The White/Black wire from the PTO should connect to chassis ground, probably to a terminal on your board. There "may" be another wire from the PTO, I don't have a TR-4 here to check, and have no idea as to the color code. But if you have one "left over", it would connect to that 22k ohm resistor. The other end of that resistor goes to Pin 2 of the RV-4 connector. I don't know much about the RV-4, but it looks like that Pin 2 is grounded or "open" for "normal" transceiver operation, and applies a positive voltage to the internal PTO to disable it and allow the RV-4 to control. My understanding is that the transceiver should operate normally with the RV-4 unplugged, which would leave that lead "floating", e.g., even if that wire were not connected to the 22k resistor the transceiver should work normally without the RV-4 plugged in. Let me know!! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs Boyd Van Horn wrote: > Gary, I purchased your best CD from you and love it. However, I have a > TR-4 C that is serial number 23470, that has a different pc boad than > any of your pictures. It is adjacent to the VFO jones plug toward the > filter cap. It has a .02 cap along with a 100, 22K, and 330 ohm > resistor. I have PTO problems with this unit. It will tune using the > external VFO, but not the internal one. I made a note where all the > wires go when I pulled the PTO, but have lost it so I need some sort > of picture to help. Got any ideas ? Boyd W0BUW > > *//* -- 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] 2CQ or 2CN
Gary, I purchased your best CD from you and love it. However, I have a TR-4 C that is serial number 23470, that has a different pc boad than any of your pictures. It is adjacent to the VFO jones plug toward the filter cap. It has a .02 cap along with a 100, 22K, and 330 ohm resistor. I have PTO problems with this unit. It will tune using the external VFO, but not the internal one. I made a note where all the wires go when I pulled the PTO, but have lost it so I need some sort of picture to help. Got any ideas ? Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Bill - Yes, the early units were labeled 2CN both on the schematic and the rear panel, probably up through s/n 999. Probably done by someone who was NOT there during the 2-A and 2-B models! Schematic and rear panels for s/n 1000 and up was labeled 2CQ. Wiring is identical. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B, C-Line & TR-4/C Service Supplement CDs Bill Ellis wrote: > There were 2 models of the 2C. One had a connection on the rear > labeled 2CQ and the other 2CN. Is either connection for the the 2CQ? > > Thanks, > > Bill, WB9CAC > > -- 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] RE: Drake L-4B cooling fan blades.
Does anyone have a source for fan blades for the old reliable Drake L-4B ? Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Steve - I assume you have the shorting plug in the MUTE jack? :-) First lift up slightly on the Calibrator board. Sometimes the leads are left too long on the bottom of the board and short out to the chassis if it's pushed all the way down. There are fully annotated photos of the NB-4 on my C-Line CD, but Drake didn't provide any description or voltage information. I have a scan of the 34-PNB Noise Blanker on my TR-4 CDs, which are essentially the same circuit, and it has a circuit description included. That CD also has a separate set of photo's with voltage measurements for the 34-PNB. If you want the C-Line CD, I could include a copy of the 34-PNB manual and docs on it as well. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, B & C-Line and TR-4/C Service Supplement CDs STEVE SCOGGINS wrote: > STEVE SCOGGINS made an utterance to the drakelist gang > -- > I have a Drake R-4C receiver with the 4-NB noise > blanker that is not working. > > I have the 4-NB manual with schematic from the bama > website. > > There is no receiver audio when switched to NB > position. Using a scope I can see that the 7.935 Mhz > oscillator in the NB is oscillating. Perhaps the FETs > are blown in the NB. > > Does any one have a parts layout and theory of > operation for this NB. This type of info. would be > useful for troubleshooting. > > 73 Steve KE7RR > > -- 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] antenna info
Anyone know where one can buy a new front panel for an L4-B amplifier ? I got a good deal on it but the front panel has quite a few scatches. I also need the high voltage scew in plug for the amp end of the hight voltage lead. Thanks, Boyd W0BUW Terrell Hamilton <[EMAIL PROTECTED]> wrote: "Terrell Hamilton" made an utterance to the drakelist gang -- Parachute cord has worked extremely well for me - it's multistranded and braided as well. I don't know if it is nylon or Dacron, but I think it may be UV resistant. Terry K7WLD -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James Johnson Sent: Tuesday, April 01, 2008 4:24 PM To: [EMAIL PROTECTED] Subject: RE: [drakelist] antenna info "James Johnson" made an utterance to the drakelist gang -- I would not use nylon for outside use as it is very susceptible to UV degradation and will break after a while. Use polyester which is much more durable. Double braid is much preferred over three strand. And black or dark color blends in better. JJ N3JTM -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Karl Corder Sent: Tuesday, April 01, 2008 6:00 PM To: [EMAIL PROTECTED] Subject: [drakelist] antenna info Karl Corder made an utterance to the drakelist gang -- Special thank you's to all that responded to my antenna request for information and recommendations. I received a wealth of information and knowledge and as soon as the 40 to 50 mph winds subside and the temperature stays in the 60's for a day or two I am going to try and reinstall my bolted together set of 2x 4's with a radio works pulley system at the top (hopefully that won't break like my last nylon cord did) and be able to try various center and off center fed antennas. What was surprising was that I didn't receive any comments on the AV-18HT. I would imagine that the expense of this antenna and the effort to install it might have something to do with this. Thanks again, all comments were greatly appreciated. Karl WA2OVJ Penfield, NY You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost. http://tc.deals.yahoo.com/tc/blockbuster/text5.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 -- -- 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] great items for old fogies
That idea on the soldering iron is great. I forget mine all the time. It is only 45 watts, but could still do some damage. My ham friend found out about another great item. We have Steves Warehouses here in Oklahoma. For $19.95 you can get one of those measuring wheels to measure your antenna wire as you erect your new antennas. I am getting one right away. 73's Boyd W0BUW Eugene Balinski <[EMAIL PROTECTED]> wrote: "Eugene Balinski" made an utterance to the drakelist gang -- I NEED the time, thanks ! I need it to be sure that I shut off the coffee pot ! 73 K1NR On Sun, 2 Mar 2008 20:24:55 -0500 "Chuck Grandgent" wrote: > Got a couple items from Allelectronics that I am really > happy with: > > "HEAD MOUNTED MAGNIFIER", $4.95 - Seen this item for > years, finally ordered > one. 3 combinations of lenses. > My eyesight is fine, but I can't believe how much easier > it makes the job > working on my Drakes. > > "DIGITAL ON-TIMER ", $5.00 - This is apparently the timer > guts from a Mr. > Coffee. > Forgot and left the soldering iron on TOO MANY TIMES > recently, but no more. > Now it'll shut off after two hours unless I intervene. > > Chuck, K1OM - Web mail provided by NuNet, Inc. The Premier National provider. http://www.nni.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] TR4-C interface to Ameritron AL-811
Garey, Thanks for your answer. I think I will just use the linear on my other rig, which is a Yaesu FT 1000 MD V. Sincerely, Boyd Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Boyd - Probably not. The problem here is that the PiNet output circuit is designed to match the plate impedance of three tubes to ~50 ohms. By removing two tubes from the plate circuit, you are tripling the impedance of that side of the network. It's possible that it could handle that, but unlikely. The tank Q would be very high, and so extremely narrowband and with much higher losses. Safer than letting the plate caps "float" would be to reduce the screen voltage on the Final, but the matching problem would still exist. 73, Garey - K4OAH St. Charles, IL Boyd Van Horn wrote: > Garey, I know we need to leave all the finals in on a TR-4 because of > the series parallel filaments, but could one leave the plate caps off > one or two tubes to cut the power output instead of using a power > reducing network ? Boyd W0BUW > > */Garey Barrell /* wrote: > > > Garey Barrell made an utterance to the drakelist gang > -- > There is a set of N.O. contacts on Pins 5 and 8 of the Jones > connector > that close on transmit that can be used to ground the relay in the > Ameritron. They are rated at 2 A at 250 VAC so no problem handling > the > relay current. If you're using an AC-4 power supply, these > contacts are > wired to the two-pin connector on the side of the AC-4 marked VOX. > > The TR-4C expects a negative ALC voltage from the linear. If the > Ameritron provides this, it will work, but may require some sort of > level adjustment. The TR-4C has MUCH too much power output to > drive a 1 > kW linear. Aside from the fact that the amp is less than one-half > S-Unit increase in signal strength over the TR-4C, you will need some > sort of resistive pad between the two to keep from overdriving the > amp. The TR-4C will put out 200+ watts and the AMP will probably put > out 500. > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B & C-Line Service Supplement CDs > > > > > Boyd Van Horn wrote: > > Could someone out there help me with the interface to use > between my > > TR4-C's and the Ameritron AL-811. The ameritron has its own > > Transmit/Receive relay which uses 12 VDC at a 100 ma when > grounded. Is > > there anyway to use the ALC circuit on the Amp with the Drake ? > Boyd > > W0BUW > > > > -- > 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] TR4-C interface to Ameritron AL-811
Garey, I know we need to leave all the finals in on a TR-4 because of the series parallel filaments, but could one leave the plate caps off one or two tubes to cut the power output instead of using a power reducing network ? Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- There is a set of N.O. contacts on Pins 5 and 8 of the Jones connector that close on transmit that can be used to ground the relay in the Ameritron. They are rated at 2 A at 250 VAC so no problem handling the relay current. If you're using an AC-4 power supply, these contacts are wired to the two-pin connector on the side of the AC-4 marked VOX. The TR-4C expects a negative ALC voltage from the linear. If the Ameritron provides this, it will work, but may require some sort of level adjustment. The TR-4C has MUCH too much power output to drive a 1 kW linear. Aside from the fact that the amp is less than one-half S-Unit increase in signal strength over the TR-4C, you will need some sort of resistive pad between the two to keep from overdriving the amp. The TR-4C will put out 200+ watts and the AMP will probably put out 500. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Boyd Van Horn wrote: > Could someone out there help me with the interface to use between my > TR4-C's and the Ameritron AL-811. The ameritron has its own > Transmit/Receive relay which uses 12 VDC at a 100 ma when grounded. Is > there anyway to use the ALC circuit on the Amp with the Drake ? Boyd > W0BUW > -- 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] TR4-C interface to Ameritron AL-811
Garey, I knew if you would answer you would know. I think you are right about the db diff in 300 watts. Not very much so may not be worth it. Thanks, Boyd Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- There is a set of N.O. contacts on Pins 5 and 8 of the Jones connector that close on transmit that can be used to ground the relay in the Ameritron. They are rated at 2 A at 250 VAC so no problem handling the relay current. If you're using an AC-4 power supply, these contacts are wired to the two-pin connector on the side of the AC-4 marked VOX. The TR-4C expects a negative ALC voltage from the linear. If the Ameritron provides this, it will work, but may require some sort of level adjustment. The TR-4C has MUCH too much power output to drive a 1 kW linear. Aside from the fact that the amp is less than one-half S-Unit increase in signal strength over the TR-4C, you will need some sort of resistive pad between the two to keep from overdriving the amp. The TR-4C will put out 200+ watts and the AMP will probably put out 500. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Boyd Van Horn wrote: > Could someone out there help me with the interface to use between my > TR4-C's and the Ameritron AL-811. The ameritron has its own > Transmit/Receive relay which uses 12 VDC at a 100 ma when grounded. Is > there anyway to use the ALC circuit on the Amp with the Drake ? Boyd > W0BUW > -- 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] TR4-C interface to Ameritron AL-811
Could someone out there help me with the interface to use between my TR4-C's and the Ameritron AL-811. The ameritron has its own Transmit/Receive relay which uses 12 VDC at a 100 ma when grounded. Is there anyway to use the ALC circuit on the Amp with the Drake ? Boyd W0BUW
Re: [drakelist] ac4 write up
How about running the bias through the coil of an in line small relay. It is held in any time the negative voltage is present. The present final cathode to ground circuit would be run through the normally closed relay points. Loss of any bias current and the relay cuts off the finals. Boyd W0BUW Bill Horne <[EMAIL PROTECTED]> wrote: Bill Horne made an utterance to the drakelist gang -- Mike, I understand, and perhaps "Crowbar" is the wrong term: there's certainly enough technical expertise on the list to suggest a viable circuit. Here's my idea: if bias drop below 50% of normal, then we could trigger an SCR to short the AC source and blow the fuse. 73, Bill W1AC Mike Bryce wrote: > > Mike Bryce made an utterance to the drakelist gang > -- > Gosh.. > > I thought about that, but here's no way to crowbar the bias circuit. > > in the old supplies, the damage is caused by a "lack" of bias. So, if > there is a failure of the bias supply, i.e. it quits, how can you fix > that? > > the only way I could come up with would have been a system that > deprives the transformer of it's primary voltage, shutting down the > supply. It would have to default in the off position too, as you would > not want the supply to cycle on, find the missing bias, then shut > down, the power up, find the missing bias supply, shut down and on and > on. > > > mike > > Mike, WB8VGE > SunLight Energy Systems > The Heathkit Shop > http://www.theheathkitshop.com/ > J e e p > o|||o > Note: No trees were killed in the sending of this message, but a large > number of electrons were terribly inconvenienced > > > On Dec 15, 2007, at 5:28 PM, Bill Horne wrote: > > > Bill Horne made an utterance to the drakelist > gang > -- > Is there a provision in the kit for a crowbar circuit to safeguard the > rig if the bias (or other) supply fails? > > Bill, W1AC > > > > -- > 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 > -- > -- Lookng back through time you know its clear that i've been blind I've been a fool To open up my heart to all that jealousy that bitterness that ridicule David Gray -- 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] Somewhat OT: Experiment
Your seller is rippng you off. I have sold on E-bay for many years and the shipping information is via UPS, FEDEX, USPS, etc and is estimated by furnishing the weight, dimensions, ship point, delivery point and special fees. E-bay has nothing to do with the cost of shipping. They simply provide a method for the buyer to use to view the cost that the seller has provided from the shipping service. E-bay deserves a lot of slams, but this is not one of them. Boyd W0BUW Mark Pilant <[EMAIL PROTECTED]> wrote: Mark Pilant made an utterance to the drakelist gang -- Thank you all very much. Here was the motivation for the experiment... I just recently purchased a TR-3/RV-3/AC-3/W-7 on eBay, and the the shopping costs were shown as $44.00. I assumed, since I had know reason to think otherwise, this what what the seller specified for shipping charges. I was a little surprised when the actual shipping charges came in at $120.00. (I have always sold items specifying the buyer will bay the actual shipping charges.) We agreed to split the difference (of $44 and $120) and all went well. However, I got to thinking the shipping costs might be generated by eBay. It appears this is the case. So I just sent the seller the remaining shipping amount to make sure everything was square; and he did not get the short end of eBay's "friendly" shipping cost "estimate". So I guess the bottom line is to make sure, if it is not explicitly stated in the auction, to confirm with the seller what the actual shipping costs are. Thank you all for your time and help with my experiment. 73 - Mark N1VQW -- 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] AC3 VS AC4
Garey, Have you had any experience with attaching an old Heathkit Warrior Linear to a Drake TR4-C? Sincerely, Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Alan - The AC-3, (with the exception of a very few early units,) is functionally identical with the AC-4. The fault that makes an AC-3 "cook a set of finals" is exactly the same fault that can cause an AC-4 to do the same! This "fault" is a failure of the bias portion of the power supply, which is identical in both supplies. The bias supply is by far the most "critical" part of the AC-3/4. It is used to keep the T/R relay in the standby condition, and limits the idle current drawn by the final tubes in transmit, among other things. The failure mode is this. One or both of the filter capacitors in the bias supply of the AC-3/4 dries out. The "early warning", if you're lucky, is erratic VOX operation, the VOX taking longer to drop out than it should, or increasing idle current in the final. If you're NOT lucky, like most of us, one of the filter caps will short, killing the bias supply completely. Even if the transmitter is in standby, while you have gone to the kitchen for a snack, or to a hamfest, when the bias supply fails the T-R relay will close, putting the transmitter in transmit. Since there is no bias, the final tubes will draw as much current as they can until either one of the final tubes melts, shorting the HV supply, and hopefully blowing the power supply fuse, (assuming you or a previous owner hasn't replaced it with a piece of #000 copper wire,) or burning up the transmitter, power supply and/or house! Alarmist? Yeah. You wanna take the chance? Didn't think so... At the very least, with a "new" or unknown, or even a supply you've had "for years", replace the filter caps on the bias supply NOW if they haven't already been replaced within the last 10 years. Better yet, upgrade your AC-3/4 with the AC-4R kit from Mike at The Heathkit Shop, and forget about it for another 30 years or so. Also, check that the fuse is either 5 or 6A Slo-Blo. Early supplies are marked 5A, but tended to blow from the turn-on surge and so was increased to 6A. Finally, (at last,) the answer to your question Yes, the supplies are fully interchangeable across the 4 Line. The AC-3 doesn't have the VOX connector to key a linear amplifier, since the AC-3 was for the TR-3 and very few people wanted to put a linear behind a transmitter that put out 200 W. The little RCA jack pigtail coming out of the back of the PS connector was originally wired for the speaker with the TR-3 or TR-4. If you need an external VOX jack, the easiest way is to add another RCA pigtail in the Cinch connector. 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs [EMAIL PROTECTED] wrote: > [EMAIL PROTECTED] made an utterance to the drakelist gang > -- > I was trying to find out if the AC3 power supply can be used with the T-4 > series transmitters or whether the AC4 is necessary. Searching the Drake > archives I stumbled across one of the few postings addressing the subject: > LIST > POSTING- > >> Does anyone know if there is a differnce between the Drake AC-4 and >> AC-3 power supplies electrical wise in the connector? I have both and >> the AC-4 works fine but the AC-3 seemed to cause various problems including >> cooking a set of finals in a T4XB. Seems like it causes the T4XB and T4XC >> to go into transmit part of the time. >> > -- > - > I was hoping to get a clarification from this list. > > Thank you > > Alan KB7MBI > > > -- 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] The L-4 amplifier
Howard, He is correct. Go to this site to see evaluation of L-4. Boyd W0BUW http://www.eham.net/reviews/detail/1527 Howard Traxler <[EMAIL PROTECTED]> wrote: "Howard Traxler" made an utterance to the drakelist gang -- Hi all, I've been looking for an L-4 amp. Now I met someone on the air who is running one. He says it does not cover 160 meters. Is that correct? Must I rethink my search for an amp? boo hoo 73, de Howard, WA9RYF -- 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] UPay or ebay help
Howard, If you will click on his user name and then click all feedback you will notice he has a total sales of 10287 with 149 negative. He is known to display some different pictures than the real thing. I have purchased an AC-4 from him and it was ok. As long as the transformer is OK, you will probably want to upgrade it anyway. That other AC-4 at buy it now for $160.00 is too high in my judgement. Hope this helps. Boyd W0BUW Howard Traxler <[EMAIL PROTECTED]> wrote: "Howard Traxler" made an utterance to the drakelist gang -- Could someone out there please give me a hand understanding this thing? Since you folks don't seem to like ebay, maybe someone could write off-list to [EMAIL PROTECTED] Thanks. I am watching a Drake AC-4 being sold by Radio Mart (whom you have mentioned before). After his name, I see the number 5909 then it says Feedback score is 5,000 to 9,999) This would indicate to me that his rating is very low in that range. But then it says Member is a PowerSeller Feedback: 97.6% Positive 'tseems to me that in a range (rough) of 5000 to 1, 6000 would be about 20%. but if they say 97%, ??? I'm looking for an AC-4, so I would bid on this thing; but reading stuff here on the list makes me want to shy away a bit. Can somebody suggest what I should think? Thanks a whole lot. 73, DE Howard, WA9RYF -- 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] T-4XB problem?
Garey, I changed R-135 to 33K and it did the trick. I now have bias of -11 volts. Thanks for your help. Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Boyd - Well I've never noticed the bias voltage on the relay tube going up with increased AF gain, but then I've never looked! :-) Other things that can cause the relay to "hang" is if the ANTI-VOX is turned up too high (might key in on AF Gain affecting bias), or if the VOX is turned up too high, or if R106 has gone up in value. Try turning the ANTI-VOX down all the way, and then bringing up slowly until it just prevents tripping of VOX. As you can see, it's a fairly high impedance circuit, so can be difficult to troubleshoot. You should be seeing closer to -5 to -6V on Pin 2 in receive. Depending upon your unit serial number, you might try reducing R135 from 68k to 33k. This "stiffens" the cutoff supply and you should see closer to -10V on PIn 2 with key-up. I have seen a leaky cap at C205, but not likely. Let us know! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Boyd Van Horn wrote: > Garey, I also have a tr4-C that the relay holds in transmit. I have > done all the things you recommended. I did notice one thing. The neg > bias on the 6ev7 on the relay control side is -3.7 volts when it is in > receive. But when you increase the audio gain, the bias goes to -6.8 > volts. Is this normal ? Sincerely, Boyd W0BUW > *//* -- 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] T-4XB problem?
Garey, I also have a tr4-C that the relay holds in transmit. I have done all the things you recommended. I did notice one thing. The neg bias on the 6ev7 on the relay control side is -3.7 volts when it is in receive. But when you increase the audio gain, the bias goes to -6.8 volts. Is this normal ? Sincerely, Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Bill - Bias voltage is relied on to open the relay by cutting off the 6EV7 relay tube and if that voltage is low because of leaky electrolytics or ripple in the Bias supply in the AC-3/4., the tube doesn't cut off as quickly. Since you have eliminated the supply, another possibility is that the 6EV7 is slightly gassy, which again causes tube to want to continue conducting after it is told to cut off, especially after long transmissions! Yet another possibility is that the final tubes are dropping in emission, which requires you to set the bias voltage more positive to set the idle current to the proper value, again resulting in reduced negative voltage to cut off the 6EV7. Lastly, there are several very high value carbon composition resistors in the biasing for the VOX. ANTI-VOX and Relay circuits that can increase in value with age, resulting in insufficient cut off bias for the 6EV7. A rule de thumb is that the bias voltage at the Final grids is typically -60 to -65VDC for nominal idle current. Let us know what you find! 73, Garey - K4OAH Glen Allen, VA Drake 2-B, 4-B & C-Line Service Supplement CDs Bill Ellis wrote: > Recently having put my T-4XB/R-4B combo back on the air after 1 year > off, I'm finding that when I put the T-4XB in spot mode, I can't get > the relay to return to the receive mode. This is not keying the > finals(I don't think), it just seems to hang up in the spot mode. > About 3-4 years ago, I had rebuilt the AC-4(cap's and all), so I don't > think that is the problem. Now I know the the anti-vox and vox delay > affect how long the relay remains engaged.I have tried that > combination with no success. I could just be getting the wrong combo. > My question is where is a good starting point for these two controls. > Also, could this be a bad 6EV7? > > Thanks for any help & 73's > > Bill, WB9CAC > Tempe, Az -- 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] t-4xb ssb filter
Call International Crystal (Inrad) 13620 Tyree road, Umpqua, Or 97486 Phone 541-459-5623. Web site Coulee.com. Good luck, Boyd W0BUW Carey Lockhart <[EMAIL PROTECTED]> wrote: i am looking for a lower sideband filter for the t-4xb. does anyone have a spare they would sell. i have checked the web .also checked all the vintage parts dealers that i am aware of, but still nothing. Carey Lockhart, KC5GTT [EMAIL PROTECTED] www.kc5gtt.com
Re: [drakelist] TR-4 Problem
Garey, The reason i mentioned the final filaments is I found one set with only one of the filaments not working . It allowed the receiver to function, but not quite up to par. You seem to be very knowledgable on these, so I have a problem maybe you can help me with. I have an eary TR4- SN 23470. The on board PTO will not function, but the external vfo will function fine. It has the 3 section filter cap instead of 4 like the later models and a bunch of stand up component boards unlike the later ones. What do you normally find wrong in that situation ? I have fulled out the PTO and the circuit if different than my schematic. It only has one diode instead of two and the components are located in different places. Any help would be appreciated. Boyd W0BUW Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- The final filaments are in series with most of the receiver tube filaments, so if the receiver is working, that is not the problem. The bias supply should be variable from approx -45 to -85V. The screens should have approximately 250 VDC, current limited to less in X-CW. The plate voltage is 650 VDC. IF these voltages are present, and the cathodes are grounded through the 15 ohm cathode resistors, you should be able to adjust the bias for the 0.1A idle current. The system is the same as the T-4XC, just one more tube. Same rules. 73, Garey - K4OAH Boyd Van Horn wrote: > Carl, Check the filaments on the finals. They are all three in > parallel and drop the 12.6 volts to 6.3 for the remainder of the > tubes. The wires to the filaments are small and brittle. Measure the > Bias voltage coming out of the power supply- should be at least -65 > and you should be able to reduce it to zero. When you go to X-CW you > should have 350 volts on the final screens and when you go to ssb the > voltage should go to 650 volts. Be Careful !!! Also the sealed > transmit /receive relays are known to go bad. If you need one you can > order from Mouser in Texas- the manufacturers part number is > R10-EIY4-V2.5K. Good Luck, Boyd > > */Garey Barrell /* wrote: > > > Garey Barrell made an utterance to the drakelist gang > -- > Carl - > > No. No modifications are necessary to use the 6GJ5. Pin 8 is no > connection in the 6GJ5, and is the suppressor grid on the 6JB6, > which is > grounded. > > You say NO plate current. Do you have bias current? > > Garey - K4OAH > St Charles, IL > > [EMAIL PROTECTED] wrote: > > [EMAIL PROTECTED] writes: > > abbreviated excerpt below > > > > The 6GJ5's will work fine... Garey - K4OAH > > > > Hi, TR4 will not tune up...no plate current...have been advised > that > > 6GJ5's may have to have pin 8 cut off. > > Your thoughts. > > Carl Hibbard WD8NHK > > > > -- 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] Project stuff and list owner ?
Carl, Check the filaments on the finals. They are all three in parallel and drop the 12.6 volts to 6.3 for the remainder of the tubes. The wires to the filaments are small and brittle. Measure the Bias voltage coming out of the power supply- should be at least -65 and you should be able to reduce it to zero. When you go to X-CW you should have 350 volts on the final screens and when you go to ssb the voltage should go to 650 volts. Be Careful !!! Also the sealed transmit /receive relays are known to go bad. If you need one you can order from Mouser in Texas- the manufacturers part number is R10-EIY4-V2.5K. Good Luck, Boyd Garey Barrell <[EMAIL PROTECTED]> wrote: Garey Barrell made an utterance to the drakelist gang -- Carl - No. No modifications are necessary to use the 6GJ5. Pin 8 is no connection in the 6GJ5, and is the suppressor grid on the 6JB6, which is grounded. You say NO plate current. Do you have bias current? Garey - K4OAH St Charles, IL [EMAIL PROTECTED] wrote: > [EMAIL PROTECTED] writes: > abbreviated excerpt below > > The 6GJ5's will work fine... Garey - K4OAH > > Hi, TR4 will not tune up...no plate current...have been advised that > 6GJ5's may have to have pin 8 cut off. > Your thoughts. > Carl Hibbard WD8NHK > > > > > > > > > See what's new at AOL.com > and Make AOL Your > Homepage . -- 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] TR4-C relay control tube.
These are three good finals. I am getting over 250 watts on 20 and 40 meters, less on 15 and 10. I have tried changing the bias in resting condition from less than .1 to more than .1 and that does not help. I know the power supplies are good and I have both of them with the updated circuit boards in them. Boyd Gary Poland <[EMAIL PROTECTED]> wrote: "Gary Poland" made an utterance to the drakelist gang -- Boyd, What kind of power are you getting from your 6JB6's? What I have seen happen is when the final tubes weaken the bias voltage has to be set more positive to obtain the 100 ma plate current. Since the negative bias voltage is also used by the VOX circuit it plays havoc with tube's abiltiy to release the relay. Not an issue if your finals are in good shape. 73, Gary W8PU http://home.cinci.rr.com/w8pu -- 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] TR4-C relay control tube.
One of my TR-4s has the following problem: Malfuncions after 5 minutes RF gain in any position Audio gain in any postion When you switch to XCW and tune up, upon going back to SSB the control tube will not let the tansceiver go back to rec. The B+ is not on the transmitter, but the plate meter is reading .1 which indicates the power supply bias is set properly. If you switch the band sw back and forth to other bands, it will correct itself and start receiving again. I use PTT and have the vox control full clockwise and anti-vox full counter clockwise. I bought a new brumfield/potter enclosed relay and that did not help. I have changed the 6EV7 control tube with a nos tube. I am now thinking it is the time constant network going to the grid of the 6ev7 which contains a series 1K resistor going to the grid and a series of bias resistors and diodes from the primary side of the grid resistor to antivox circuit and a series of high ohm grid bias resistors. I am about ready to start changing the time constant resistors and caps one at a time. Has anyone out there had this problem ?73's Boyd W0BUW
