model 20 hum (detector circuit?)

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model 20 hum (detector circuit?)

OZ4
Senior Member

Posts: 285
Threads: 27
Joined: Nov 2012
City: Tehachapi. California

#17

10-25-2015, 10:39 AM

And as for the bias on the 27 since both 27 and the 71s bias come from the same line and with the bias voltages on the 71s are correct it must be either the bias resistor or the meter you are using. I would try an old analog Simpson meter or hanging a 200k resistor across a digital one.

( I was thinking a 5meg resistor would be a correct load. But using the a Simson on the 10v scale at 20k/volt would be 200k loading)

!!!!!!!!!!!!!!!!!!!RESISTANCE IS FUTILE!!!!!!!!!!!!!!!!!!!!!!
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     [Image: http://philcoradio.com/phorum/images/smi...on_eek.gif] Chris

(This post was last modified: 10-25-2015, 10:43 AM by OZ4.)

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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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