OK T4XB is working now. Finally (with lots of help) and Thanks to the group found a shorted Cathode to Filament in V1 which was causing the 'Tranmit Line' to turn on when it was supposed to be in Standby/Rcvr. Just made a contact with it and got a good report. Still have RF output a bit low but I think will leave it alone this time...
THANKS!!! Paul K3PG some rig pix and snow at: http://pgerhardt.blogspot.com On Tue, Feb 9, 2010 at 12:00 PM, <[email protected]> wrote: > Send Drakelist mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://mailman.zerobeat.net/mailman/listinfo/drakelist > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Drakelist digest..." > > > Today's Topics: > > 1. Re: Cleaned the TR-4 (Garey Barrell) > 2. Re: Cleaned the TR-4 (Richard Palmer) > 3. Re: T4XB No +250V AND blown Filament Fuse (Paul Gerhardt) > 4. Re: T4XB No +250V AND blown Filament Fuse (Garey Barrell) > 5. ECL counter IC source? (Curt Nixon) > 6. Re: MC10138 ECL counter IC source? (Gary Poland) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 08 Feb 2010 15:56:42 -0500 > From: Garey Barrell <[email protected]> > Subject: Re: [Drakelist] Cleaned the TR-4 > To: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Richard - > > The S-Meter is Zero'd with the cleverly disguised ZERO control on the > right side of the chassis.!! :-) > > Disconnect antenna, detune RF TUNE control, and adjust ZERO control for > S1 on the meter. There is no S0 on Drake meters! > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs > <www.k4oah.com> > > > Richard Palmer wrote: > > > > There is on thing that is not spelled out. Zeroing the meter. I > > cleaned all the pots and when I went to zero the meter I found nothing > > to help me determine the proper setting. So any help there is > > appreciated. > > > > ------------------------------ > > Message: 2 > Date: Mon, 08 Feb 2010 18:06:42 -0500 > From: Richard Palmer <[email protected]> > Subject: Re: [Drakelist] Cleaned the TR-4 > To: [email protected] > Cc: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Gary, > > Since I cleaned it I knew where it was. I noticed that the zero adjust > affected the meter's reading of the bias also ... so I wanted to get it > set correctly. > > Thanks for your help, > Richard Palmer > > Garey Barrell wrote: > > Richard - > > > > The S-Meter is Zero'd with the cleverly disguised ZERO control on the > > right side of the chassis.!! :-) > > > > Disconnect antenna, detune RF TUNE control, and adjust ZERO control > > for S1 on the meter. There is no S0 on Drake meters! > > > > 73, Garey - K4OAH > > Glen Allen, VA > > > > Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs > > <www.k4oah.com> > > > > > > Richard Palmer wrote: > >> > >> There is on thing that is not spelled out. Zeroing the meter. I > >> cleaned all the pots and when I went to zero the meter I found > >> nothing to help me determine the proper setting. So any help there is > >> appreciated. > > > > _______________________________________________ > > Drakelist mailing list > > [email protected] > > http://mailman.zerobeat.net/mailman/listinfo/drakelist > > > > > > > -- > The law, in its majestic equality, forbids the rich as well as the poor to > sleep under bridges, to beg in the streets, and to steal bread. - Anatole > France > > > > > ------------------------------ > > Message: 3 > Date: Mon, 8 Feb 2010 18:30:25 -0500 > From: Paul Gerhardt <[email protected]> > Subject: Re: [Drakelist] T4XB No +250V AND blown Filament Fuse > To: [email protected] > Message-ID: > <[email protected]> > Content-Type: text/plain; charset="iso-8859-1" > > OK still troubleshooting but found 2 more clues.... > > I pulled all the tubes and the AC4 power resistor R3 in the 250V line is > now > cool to touch and V is 260V with NO tubes in. > When OA2 is in place (only OA2) R3 is too hot to touch and V drops about > 12V. > > 2nd Clue I finally found what smoked in the chassis. It was hiding under a > switch shaft in the RF compartment. The 'smoker' was R30 the 68 ohm 1/2 > watt resistor on V5 (final) > > So I think maybe the tube had a grid to fil short and took out both > circuits. > > I am still not getting a spot signal. R3 is still too hot when OA2 is 'IN' > > OA2 is blue not shure otherwise if it is good? Problem may be on the 150 V > line as that powers the VFO (I think). > > Still have the tubes out. > > Paul K3PG in 'snowy' MD > pix on http://pgerhardt.blogspot.com > > > > > On Thu, Feb 4, 2010 at 11:31 AM, Paul Gerhardt <[email protected]> > wrote: > > > Turned on my Working T4Xb and smoke came out the bottom of the rig which > I > > can't see for some reason. The filimant fuse (8A pigtail lead fuse near > the > > 3 big power resistors) is open so replaced that, then no 250 V B+ and > found > > R3 1K 5 watt resistor to be open. Both of these were 'effect' and not > cause > > (I suspect). I changed R3 and got 150V and R3 is hot. Unhooked the > yellow > > 250V wire to the rig and V is good about 270V. Turned power OFF and > > measured Resistance on yellow wire and it is low only about 150 ohms. > Last > > thing is always suspect and for this the last thing I did a few days ago > was > > install some used FleaBay finals which worked ok it seemed but were very > > weak only about 60-70 watts out (maybe one was not working?) Put the > bright > > light on the bottom and compared to photo I took before and fail to 'see' > > any burned parts on the bottom but there was smoke and I think it was > from a > > hot wire and not a componet. Will probably change the finals back to the > > 'other' weak ones that were at least putting out 120W into the Cantenna > and > > see what is pulling the 250V B+ line down. > > Any ideas on this one? > > > > 73 > > Paul > > > > > > > > > > > > -- > > Paul Gerhardt > > K3PG > > http://pgerhardt.blogspot.com > > QRP ARCI 6674 > > FP 274 > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mailman.zerobeat.net/pipermail/drakelist/attachments/20100208/27c594ef/attachment-0001.html > > > > ------------------------------ > > Message: 4 > Date: Mon, 08 Feb 2010 18:47:59 -0500 > From: Garey Barrell <[email protected]> > Subject: Re: [Drakelist] T4XB No +250V AND blown Filament Fuse > To: [email protected] > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Paul - > > OK. See below. > > 73, Garey - K4OAH > Glen Allen, VA > > Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs > <www.k4oah.com> > > > Paul Gerhardt wrote: > > OK still troubleshooting but found 2 more clues.... > > I pulled all the tubes and the AC4 power resistor R3 in the 250V line > > is now cool to touch and V is 260V with NO tubes in. > > When OA2 is in place (only OA2) R3 is too hot to touch and V drops > > about 12V. > > The 0A2 will glow blue when it is working, and will have +150V across > it. 12V drop across R3 is a little high, but is about 1.5W dissipation, > assuming it is 100 ohms. > > 2nd Clue I finally found what smoked in the chassis. It was hiding > > under a switch shaft in the RF compartment. The 'smoker' was R30 the > > 68 ohm 1/2 watt resistor on V5 (final) > > So I think maybe the tube had a grid to fil short and took out both > > circuits. > > I think that's where we started! :-) > > I am still not getting a spot signal. R3 is still too hot when OA2 is > > 'IN' > > SPOT will not be present with V8 out of the socket. > > Again, 12 V drop across R3 is ok, only 1.5W, and if the 0A2 is blue, > it's regulating. The +150 bus drives the PTO, BAND OSC and the screen > of the PreMixer, along with V1, V2 Screen and V3 screen. The PTO supply > should have about 11 V on it, at the "low" end of R64, 6k @ 5W. > > > OA2 is blue not shure otherwise if it is good? Problem may be on the > > 150 V line as that powers the VFO (I think). > > > Still have the tubes out. > > Paul K3PG in 'snowy' MD > > pix on http://pgerhardt.blogspot.com <http://pgerhardt.blogspot.com/> > > > > > > > > On Thu, Feb 4, 2010 at 11:31 AM, Paul Gerhardt <[email protected] > > <mailto:[email protected]>> wrote: > > > > Turned on my Working T4Xb and smoke came out the bottom of the rig > > which I can't see for some reason. The filimant fuse (8A pigtail > > lead fuse near the 3 big power resistors) is open so replaced > > that, then no 250 V B+ and found R3 1K 5 watt resistor to be > > open. Both of these were 'effect' and not cause (I suspect). I > > changed R3 and got 150V and R3 is hot. Unhooked the yellow 250V > > wire to the rig and V is good about 270V. Turned power OFF and > > measured Resistance on yellow wire and it is low only about 150 > > ohms. Last thing is always suspect and for this the last thing I > > did a few days ago was install some used FleaBay finals which > > worked ok it seemed but were very weak only about 60-70 watts out > > (maybe one was not working?) Put the bright light on the bottom > > and compared to photo I took before and fail to 'see' any burned > > parts on the bottom but there was smoke and I think it was from a > > hot wire and not a componet. Will probably change the finals back > > to the 'other' weak ones that were at least putting out 120W into > > the Cantenna and see what is pulling the 250V B+ line down. > > Any ideas on this one? > > 73 > > Paul > > > > > > ------------------------------ > > Message: 5 > Date: Tue, 09 Feb 2010 09:04:26 -0500 > From: Curt Nixon <[email protected]> > Subject: [Drakelist] ECL counter IC source? > To: Drake Forum <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Good Morning: > > I'm looking for a couple of ECL Bi Quinary Counter IC in Dip > package..used on the DR7 board. > > MC10138 > > Anyone have a source for these where I might buy just 2? > > Thanks > > Curt > > > > ------------------------------ > > Message: 6 > Date: Tue, 9 Feb 2010 11:41:39 -0500 > From: "Gary Poland" <[email protected]> > Subject: Re: [Drakelist] MC10138 ECL counter IC source? > To: <[email protected]>, "Drake Forum" <[email protected]> > Message-ID: <d62e9cec77fb450298e635523d761...@dell4400> > Content-Type: text/plain; charset="iso-8859-1" > > Curt, > I had the same issue a few years back and the only place that resonded to > my email inquiry only offered the MC10138FN surface mount style of package. > Most of the emails I sent out to parts venders either went unanswered or the > cost was rediculous. I soldered on small leads and mounted the IC above the > board. Here is the company that I bought them from. I paid $56 for seven of > them....... > Rochester Electronics > > c/o Wendi Sabatino > > 10 Malcom Hoyt Drive > > Newburyport, MA 01950 > > 978 462-9332 X309 > > > > 73, Gary > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://mailman.zerobeat.net/pipermail/drakelist/attachments/20100209/d9ccbb56/attachment-0001.html > > > > ------------------------------ > > _______________________________________________ > Drakelist mailing list > [email protected] > http://mailman.zerobeat.net/mailman/listinfo/drakelist > > > End of Drakelist Digest, Vol 20, Issue 10 > ***************************************** > -- Paul Gerhardt K3PG http://pgerhardt.blogspot.com QRP ARCI 6674 FP 274
_______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
