AM FM Philharmonic no audio on all bands except FM. Happened when adjusting sensitivity. Fully restored with pics on the Radio Museum site.

Comment

Comment by Norman S Braithwaite on August 24, 2020 at 6:33pm

In many cases the trimmer capacitors in square boxes under the chassis would become loose from the variable selectivity shaft and could move.  The cause is expansion of the pot-metal rotor collar resulting in the set screw coming loose from the variable selectivity shaft.  It is possible that a rotor section in the grid circuit has shorted to the stator section.  If it were in the plate circuit, the 1K plate resistor would have let you know (the originals blow up emitting smoke).

Norman