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Philco 70 output transformer
#9

Okay, will go back through it looking for bad grounds. I get 0 ohms from ground of volume control to ground of wire round. I am aware of the oddity of this volume circuit, and low volumes affect the detector's cathodes as well, non linear region possibly. I did notice the inner 5k of the dual volume does not track linear with rotation checking with ohm meter, and I don't see much change there until almost half rotation, then everything is fine. Have not disassembled the volume to clean, just cleaner through the holes. After recap I noticed a low level hum, almost like a ground loop hum, not lytic loud hum, I was running 40mfd's and it was not evident, running 10's now and it is, but might point to bad ground somewhere. I ran one first position 10 and last a 40mfd and it was better than two 10mfd lytics. You can feel it in the speaker, so something is not right. This is an early non avc unit serial 850023. I will check my work also looking for errors. Thanks.


Messages In This Thread
Philco 70 output transformer - by radio1 - 05-06-2020, 07:49 PM
RE: Philco 70 output transformer - by Radioroslyn - 05-06-2020, 08:32 PM
RE: Philco 70 output transformer - by radio1 - 05-06-2020, 08:40 PM
RE: Philco 70 output transformer - by klondike98 - 05-06-2020, 10:45 PM
RE: Philco 70 output transformer - by rfeenstra - 05-06-2020, 11:31 PM
RE: Philco 70 output transformer - by klondike98 - 05-06-2020, 11:56 PM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 05:45 AM
RE: Philco 70 output transformer - by Steve Davis - 05-07-2020, 08:58 AM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 09:59 AM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 11:20 AM
RE: Philco 70 output transformer - by morzh - 05-07-2020, 11:40 AM
RE: Philco 70 output transformer - by rfeenstra - 05-07-2020, 12:01 PM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 12:21 PM
RE: Philco 70 output transformer - by morzh - 05-07-2020, 12:46 PM
RE: Philco 70 output transformer - by rfeenstra - 05-07-2020, 12:56 PM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 07:34 PM
RE: Philco 70 output transformer - by morzh - 05-07-2020, 08:46 PM
RE: Philco 70 output transformer - by radio1 - 05-08-2020, 04:17 PM
RE: Philco 70 output transformer - by morzh - 05-08-2020, 04:51 PM
RE: Philco 70 output transformer - by radio1 - 05-18-2020, 06:52 PM
RE: Philco 70 output transformer - by radio1 - 05-19-2020, 08:26 PM
RE: Philco 70 output transformer - by radio1 - 05-27-2020, 08:19 PM
RE: Philco 70 output transformer - by radio1 - 06-06-2020, 08:22 PM



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