09-12-2020, 07:22 PM
9/12/20
Hey folks. I did a total recap on 53-1750 radio/phonograph about 3 years ago. Has been running like new all this time, but lately it still works with low volume but if I turn the volume beyond a low volume, I get a LOUD high pitch squeal with no other sound.
Doesn't matter if it's the phono or the radio, same squeal. All tubes test good and replacing them from another working set does not help. I thought perhaps it was the volume/tone control, but a new one made for me by Mark Oppatt did not solve the problem. All 5 electrolytic capacitors were removed from the circuit and tested - all are good with both a capacitance meter AND and an ESR meter. Before I go replacing all the caps again, any suggestions as to what part of the circuit(s) this squeal may be coming from? If I tap around, it doesn't seem like anything is loose Thnx
Hey folks. I did a total recap on 53-1750 radio/phonograph about 3 years ago. Has been running like new all this time, but lately it still works with low volume but if I turn the volume beyond a low volume, I get a LOUD high pitch squeal with no other sound.
Doesn't matter if it's the phono or the radio, same squeal. All tubes test good and replacing them from another working set does not help. I thought perhaps it was the volume/tone control, but a new one made for me by Mark Oppatt did not solve the problem. All 5 electrolytic capacitors were removed from the circuit and tested - all are good with both a capacitance meter AND and an ESR meter. Before I go replacing all the caps again, any suggestions as to what part of the circuit(s) this squeal may be coming from? If I tap around, it doesn't seem like anything is loose Thnx
