My best guess, sounds like DC on the volume pot. Maybe a leaky coupling capacitor to the control grid of the output tube. All of the coupling, smoothing and bypass caps will need to be replaced. Some peeople get flamed for the 'shotgun' approach, but all those capacitors will be leaky or dried out, best change one at a time and check it still works. There will probably be one capacitor between the line and the chassis, often known as the 'death capacitor', since if it shorts, the chassis becomes live , not good, it has to go. If replaced then a class Y capacitor (designed to fail open) should be used, I think the US regs are 10nF max. Good luck with the set and I apologise if you know all this stuff already.
Sounds like the avc blocks the audio. If the wiper of the pot is on max the grid of the audio preamp gets more negative and so cut off. I think the coupling capacitor there (at the wiper of the pot) is leaking. Also this error drags down the avc which in return results in strong distortions
As others have said, leaky caps are usually the problem, and any paper caps ('waxies') should go as they will be poor after all those years. I wondered if the agc could also be a problem, but if so that's probably bad caps anyway. Incidentally, the capacitor on the grid of the output tube must NOT be leaky, as that can result in the grid going positive, switching the tube hard on, thus not only ruining the tube but also the output transformer winding could go.
I just watched this part, and there could be a couple of reasons.First, you have a bad resistor in the front end, or, your have silver mica issues, in your i.f. cans.Always like a little J B, too.
my parents had that radio in the kitchen playing a morning show on AM radio. WWDC 1260 AM in Washington DC
Hi, I have not been able to locate a schematic for this Emerson. Liked your video. Thanks
My best guess, sounds like DC on the volume pot. Maybe a leaky coupling capacitor to the control grid of the output tube. All of the coupling, smoothing and bypass caps will need to be replaced. Some peeople get flamed for the 'shotgun' approach, but all those capacitors will be leaky or dried out, best change one at a time and check it still works. There will probably be one capacitor between the line and the chassis, often known as the 'death capacitor', since if it shorts, the chassis becomes live , not good, it has to go. If replaced then a class Y capacitor (designed to fail open) should be used, I think the US regs are 10nF max. Good luck with the set and I apologise if you know all this stuff already.
Sounds like the avc blocks the audio. If the wiper of the pot is on max the grid of the audio preamp gets more negative and so cut off. I think the coupling capacitor there (at the wiper of the pot) is leaking. Also this error drags down the avc which in return results in strong distortions
As others have said, leaky caps are usually the problem, and any paper caps ('waxies') should go as they will be poor after all those years. I wondered if the agc could also be a problem, but if so that's probably bad caps anyway. Incidentally, the capacitor on the grid of the output tube must NOT be leaky, as that can result in the grid going positive, switching the tube hard on, thus not only ruining the tube but also the output transformer winding could go.
I just watched this part, and there could be a couple of reasons.First, you have a bad resistor in the front end, or, your have silver mica issues, in your i.f. cans.Always like a little J B, too.
Seems like it might be a speaker issue?
James Brown JUMP scare...😧