I have question about a buzzy-hum on a Zenith 7H820 Chassis 7E01 AM-FM
It happens on the FM band mostly. You can hear it ever so slightly on the AM band.
The radio has been completely restored new caps resistors tubes--replaced the selenium rectifier with a diode and resistor.
The radio works great. But why the backround buzz on the FM band (sometimes its more noticeable than at other times)
The tubes are12BA6-12BE6-12BA6-12Ba6 12Au6-19T8 it uses a 35C5 power output tube (modified by the previous owner)
My tube tester is down. Could this caused by a weak tube like the 19T8 Disc-Limiter-AVC-AF?
I can live with the sound because the radio plays so well, and picks up everything.
Thanks! Barry F.