model 20 hum (detector circuit?)

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model 20 hum (detector circuit?)

Tubesforme
Member

Posts: 107
Threads: 20
Joined: Feb 2015
City: Los Angeles, CA

#38

10-28-2015, 07:14 PM

(10-24-2015, 11:01 PM)Steve Davis Wrote: It looks the problem is after the 24 but before the 27. It could be lead dress. Try moving the 27 grid lead to see if that makes a difference.

Steve

I agree that is where the problem is. I had already done everything that everyone has suggested before I posted this request and I have redone everything again with no results. There are now only two items I question. One is the 250uuf capacitor #16 off the detector plate and the replacement interstage transformer that I put in new. (It might have leakage feeding back into the grid circuit of the 27, but it's not affecting the 71's and they are biased off the same circuit.)

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Messages In This Thread

model 20 hum (detector circuit?) - by Tubesforme - 10-19-2015, 12:11 PM

RE: model 20 hum (detector circuit?) - by Steve Davis - 10-19-2015, 02:40 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-19-2015, 05:23 PM

RE: model 20 hum (detector circuit?) - by Steve Davis - 10-19-2015, 06:03 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-20-2015, 09:01 AM

RE: model 20 hum (detector circuit?) - by mikethedruid - 10-24-2015, 06:04 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-24-2015, 08:24 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-27-2015, 02:58 PM

RE: model 20 hum (detector circuit?) - by Alan Douglas - 10-24-2015, 06:23 PM

RE: model 20 hum (detector circuit?) - by mikethedruid - 10-24-2015, 10:48 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-29-2015, 05:21 PM

RE: model 20 hum (detector circuit?) - by Steve Davis - 10-24-2015, 11:01 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-24-2015, 11:46 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-28-2015, 07:14 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-30-2015, 06:30 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-25-2015, 09:57 AM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-25-2015, 11:40 AM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-25-2015, 10:39 AM

RE: model 20 hum (detector circuit?) - by Kenneth F. Besso Jr. - 10-25-2015, 07:01 PM

RE: model 20 hum (detector circuit?) - by morzh - 10-25-2015, 10:08 PM

RE: model 20 hum (detector circuit?) - by Steve Davis - 10-26-2015, 07:38 AM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-26-2015, 09:18 AM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-26-2015, 11:14 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-26-2015, 09:34 AM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-26-2015, 10:24 AM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-26-2015, 11:12 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-27-2015, 07:43 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-27-2015, 10:38 PM

RE: model 20 hum (detector circuit?) - by Steve Davis - 10-27-2015, 11:25 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-28-2015, 12:12 PM

RE: model 20 hum (detector circuit?) - by Ron Ramirez - 10-28-2015, 01:34 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-28-2015, 07:07 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-28-2015, 10:52 AM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-28-2015, 12:08 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-29-2015, 06:50 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-28-2015, 02:36 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-28-2015, 07:03 PM

RE: model 20 hum (detector circuit?) - by Ron Ramirez - 10-28-2015, 08:10 PM

RE: model 20 hum (detector circuit?) - by radiohenry - 10-29-2015, 06:31 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-29-2015, 06:44 PM

RE: model 20 hum (detector circuit?) - by LASJayhawk - 10-29-2015, 06:57 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-29-2015, 09:10 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-30-2015, 06:21 PM

RE: model 20 hum (detector circuit?) - by LASJayhawk - 10-29-2015, 09:36 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-30-2015, 12:28 PM

RE: model 20 hum (detector circuit?) - by LASJayhawk - 10-30-2015, 02:29 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-30-2015, 02:34 PM

RE: model 20 hum (detector circuit?) - by klondike98 - 10-30-2015, 03:24 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-30-2015, 05:13 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-30-2015, 06:04 PM

RE: model 20 hum (detector circuit?) - by OZ4 - 10-31-2015, 09:40 AM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-31-2015, 01:06 PM

RE: model 20 hum (detector circuit?) - by Ron Ramirez - 11-08-2015, 09:28 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 11-09-2015, 07:11 PM

RE: Low continual hum in model 21 - by Steve Davis - 10-23-2015, 09:34 PM

RE: Low continual hum in model 21 - by Tubesforme - 10-23-2015, 10:19 PM

RE: Low continual hum in model 21 - by Steve Davis - 10-23-2015, 11:01 PM

RE: model 20 hum (detector circuit?) - by Tubesforme - 10-24-2015, 05:50 PM

Need correct voltages for det and af model 20 - by Tubesforme - 11-07-2015, 04:54 PM

RE: Need correct voltages for det and af model 20 - by morzh - 11-08-2015, 11:09 AM

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