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Hi, Gianpi,

Could you run the resistance checks again, only with no power applied? There was something strange happening there, but it could have been the way the meter reacts to mixed signals. I would expect the "near" connection to stay the same, regardless of where the shaft is rotated to; the middle connection to vary from almost ground to whatever the "near" connection reads, and the third connection to always read ground.

This is one of those cases where an oscilloscope would help a lot.

If the volume control can be unplugged from the circuit, try that and see if it still "squeals".

73

Jim W4JED