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Philco 635 Hum
#12

Mike, The movement of the vane does coincide with the voltage change. The AVC voltage changes quickly. R70 has reading of 43, 27, 224 so I guess the first section is out of spec. When I first got the radio there was a wire from ground to the first section therefore making the 43 reading 0. There is no 33A resistor but I checked all the other 1 meg resistors (3) and they are within two percent, all new anyway. As for #22 the schematic shows 2 meg but parts list says it is a 1 meg which it is in my radio. The part number for #22 says it is a 1 meg resistor in the 1936 parts catalog. I don't know what it was before I replaced it (1 meg or 2 meg). I could try 2 meg. All tubes have been swapped out with little or no change. On power up the meter shows a very narrow slit and then grows almost full width and then settles down to about 1/4 inch when station is heard so this rules out mechanical.

Rod, I have two copies of he 635 schematic and both are very hard to read so I can't really tell where junctions are. Could you please post a picture showing what you said?


Messages In This Thread
Philco 635 Hum - by dconant - 02-27-2026, 01:10 PM
RE: Philco 635 Hum - by dconant - 02-27-2026, 03:48 PM
RE: Philco 635 Hum - by RodB - 02-27-2026, 04:49 PM
RE: Philco 635 Hum - by dconant - 02-27-2026, 06:03 PM
RE: Philco 635 Hum - by dconant - 02-28-2026, 05:10 PM
RE: Philco 635 Hum - by morzh - 02-28-2026, 05:29 PM
RE: Philco 635 Hum - by RodB - 02-28-2026, 06:26 PM
RE: Philco 635 Hum - by dconant - 02-28-2026, 06:37 PM
RE: Philco 635 Hum - by morzh - 02-28-2026, 08:39 PM
RE: Philco 635 Hum - by morzh - 02-28-2026, 08:53 PM
RE: Philco 635 Hum - by RodB - 03-01-2026, 10:52 AM
RE: Philco 635 Hum - by dconant - 03-01-2026, 11:37 AM
RE: Philco 635 Hum - by dconant - 03-01-2026, 12:15 PM
RE: Philco 635 Hum - by morzh - 03-01-2026, 12:55 PM
RE: Philco 635 Hum - by dconant - 03-01-2026, 01:05 PM
RE: Philco 635 Hum - by morzh - 03-01-2026, 01:32 PM
RE: Philco 635 Hum - by RodB - 03-01-2026, 02:19 PM
RE: Philco 635 Hum - by morzh - 03-01-2026, 04:46 PM
RE: Philco 635 Hum - by morzh - 03-01-2026, 04:52 PM
RE: Philco 635 Hum - by dconant - 03-02-2026, 11:47 AM
RE: Philco 635 Hum - by RodB - 03-02-2026, 12:01 PM
RE: Philco 635 Hum - by morzh - 03-02-2026, 02:49 PM
RE: Philco 635 Hum - by dconant - 03-02-2026, 02:52 PM
RE: Philco 635 Hum - by morzh - 03-02-2026, 03:05 PM



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