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Philco Model 20 escessive hum
Tubesforme
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Posts: 107
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Joined: Feb 2015
City: Los Angeles, CA
#22

03-30-2015, 01:17 PM
(03-28-2015, 08:47 PM)klondike98 Wrote:  Glad to hear you tracked down the problem! Thanks for the update on it.

Bob, I didn't quite fix the problem. By changing out the filters and a 227 tube the hum is lower, but still too high. The main problem is the high B+. There is 285VDC on the 71A plates and it should be 250VDC.
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Messages In This Thread
Philco Model 20 escessive hum - by Tubesforme - 03-25-2015, 04:52 PM
RE: Philco Model 20 escessive hum - by klondike98 - 03-25-2015, 05:17 PM
RE: Philco Model 20 escessive hum - by Mondial - 03-25-2015, 05:34 PM
RE: Philco Model 20 escessive hum - by Warren - 03-25-2015, 07:00 PM
RE: Philco Model 20 escessive hum - by Tubesforme - 03-25-2015, 07:15 PM
RE: Philco Model 20 escessive hum - by Warren - 03-25-2015, 07:24 PM
RE: Philco Model 20 escessive hum - by Mondial - 03-25-2015, 08:02 PM
RE: Philco Model 20 escessive hum - by Tubesforme - 03-25-2015, 10:09 PM
RE: Philco Model 20 escessive hum - by Arran - 03-27-2015, 01:01 AM
RE: Philco Model 20 escessive hum - by Tubesforme - 03-30-2015, 01:11 PM
RE: Philco Model 20 escessive hum - by morzh - 03-27-2015, 09:52 AM
RE: Philco Model 20 escessive hum - by Tubesforme - 03-27-2015, 04:25 PM
RE: Philco Model 20 escessive hum - by Mondial - 03-27-2015, 04:36 PM
RE: Philco Model 20 escessive hum - by morzh - 03-27-2015, 04:51 PM
RE: Philco Model 20 escessive hum - by radiohenry - 03-28-2015, 09:16 AM
RE: Philco Model 20 escessive hum - by morzh - 03-28-2015, 10:02 AM
RE: Philco Model 20 escessive hum - by radiohenry - 03-28-2015, 04:35 PM
RE: Philco Model 20 escessive hum - by klondike98 - 03-28-2015, 08:47 PM
RE: Philco Model 20 escessive hum - by Tubesforme - 03-30-2015, 01:17 PM
RE: Philco Model 20 escessive hum - by radiohenry - 03-28-2015, 10:17 PM
RE: Philco Model 20 escessive hum - by morzh - 03-30-2015, 01:27 PM
RE: Philco Model 20 escessive hum - by Tubesforme - 03-30-2015, 01:37 PM
RE: Philco Model 20 escessive hum - by morzh - 03-30-2015, 01:41 PM
RE: Philco Model 20 escessive hum - by morzh - 03-30-2015, 01:48 PM
RE: Philco Model 20 escessive hum - by codefox1 - 03-30-2015, 03:21 PM
RE: Philco Model 20 escessive hum - by Tubesforme - 03-31-2015, 03:14 PM



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