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Philco 46-1209 strange behavior
#1

Hello, I have a 46-1209 I am restoring. I was always told the radio didn't work, however when I got it home and powered it up it seemed to work fine (with a bit of filter hum of course). I have replaced all paper caps and electrolytics, and now it doesn't work properly. When you turn it on it makes a loud click and 60hz hum. When dim-bulbed at 200w the problem goes away about 5 seconds after all the tubes are warmed up, but plugged straight into the wall it doesn't stop humming.

My observations:
- When the 7AF7 or the 56K resistor on it's 3rd pin is removed, the problem is gone, but the radio must be turned up to max to hear anything.
- When the 7AF7 is plugged in and the problem is occurring the AC volts on Pin 3 is 120, but when removed none of the pins supply 120.
- The volume control does not affect the humming

I have double checked the wiring of the new filter caps, especially around the 7AF7.

Any help is greatly appreciated.


Messages In This Thread
Philco 46-1209 strange behavior - by sq65 - 06-03-2025, 12:18 PM
RE: Philco 46-1209 strange behavior - by morzh - 06-03-2025, 03:47 PM
RE: Philco 46-1209 strange behavior - by sq65 - 06-03-2025, 04:13 PM
RE: Philco 46-1209 strange behavior - by morzh - 06-03-2025, 07:42 PM
RE: Philco 46-1209 strange behavior - by sq65 - 06-03-2025, 07:55 PM
RE: Philco 46-1209 strange behavior - by sq65 - 06-04-2025, 09:45 AM
RE: Philco 46-1209 strange behavior - by morzh - 06-04-2025, 10:47 AM
RE: Philco 46-1209 strange behavior - by sq65 - 06-05-2025, 10:22 AM
RE: Philco 46-1209 strange behavior - by MrFixr55 - 06-06-2025, 12:44 AM
RE: Philco 46-1209 strange behavior - by morzh - 06-06-2025, 08:47 AM
RE: Philco 46-1209 strange behavior - by sq65 - 06-06-2025, 09:15 AM
RE: Philco 46-1209 strange behavior - by MrFixr55 - 06-06-2025, 11:14 PM
RE: Philco 46-1209 strange behavior - by MrFixr55 - 06-06-2025, 11:21 PM
RE: Philco 46-1209 strange behavior - by sq65 - 06-07-2025, 08:12 AM
RE: Philco 46-1209 strange behavior - by morzh - 06-07-2025, 09:13 AM



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