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AA5 hum
35Z5
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Posts: 184
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Joined: Feb 2018
City: Chesapeake VA
#11

11-05-2018, 09:57 AM
Philco had best circuit to eliminate filter cap hum(Look up 46-250). A 30 mfd on cathode, followed by a 220 ohm and 25mfd(this is B+ point for output xfomer). Finally connects to a 1K ohm & 20 mfd that feeds audio output screen and other circuits in radio. I generally use three 33 mfd caps.
Tom
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Messages In This Thread
AA5 hum - by fenbach - 10-18-2018, 11:02 PM
RE: AA5 hum - by Radioroslyn - 10-18-2018, 11:28 PM
RE: AA5 hum - by Jayce - 10-19-2018, 12:05 AM
RE: AA5 hum - by Chas - 10-19-2018, 12:09 AM
RE: AA5 hum - by fenbach - 10-19-2018, 08:18 PM
RE: AA5 hum - by fenbach - 10-19-2018, 08:20 PM
RE: AA5 hum - by Chas - 10-20-2018, 12:04 AM
RE: AA5 hum - by gregb - 10-21-2018, 12:04 AM
RE: AA5 hum - by David - 11-04-2018, 03:20 PM
RE: AA5 hum - by Jayce - 11-04-2018, 09:24 PM
RE: AA5 hum - by 35Z5 - 11-05-2018, 09:57 AM
RE: AA5 hum - by morzh - 11-05-2018, 10:48 AM
RE: AA5 hum - by Squire - 11-08-2018, 01:12 AM
RE: AA5 hum - by fenbach - 03-16-2019, 11:12 PM
RE: AA5 hum - by Arran - 03-16-2019, 11:49 PM
RE: AA5 hum - by 35Z5 - 03-17-2019, 05:55 PM
RE: AA5 hum - by fenbach - 03-23-2019, 07:54 PM



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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)