[Jimmiek]

I restored a Philco 80 recently that had been in an attic in New Jersey for a long while.  The capacitors were all replaced and the power supply filters were replaced all caps are the value on diagram.  The radio has reasonable sensitivity and picks up the same stations as the Philco 37-60 in my breakfast room.  But this model 80 periodically breaks into motivating and squeals.  The adjustment for feedback can sometimes stop it but then sensitivity is too low.  This is an instability that seems to not affect the tube voltages.  One thing that may be relevant is on the most powerful station the volume control can not go all the way to silent.  The control is not open.  Any suggestions from those who have a model 80?