06-03-2025, 12:18 PM
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.
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.