The Fine Things are Always Hand Made

AM/FM Philharmonic

I was adjusting the sensitivity on the AM band when I lost audio for AM and all short wave bands. The FM band is still working. The radio was completely restored in 13 with attached pics. I have checked all the tubes. I pulled the chassis and could not find any glaring problem. Has anyone had this happen to their Philharmonic? I got the radio complete with no cabinet 11 years ago. It had once belonged to a ham and the original chrome is the best I've seen. I got a donor Philco at a yard sale for $10 and the face panel was made for another cabinet that was given to me. I like my Napier so much I thought I would do something like it with this Philly.

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Permalink Reply by Scott Seickel on August 24, 2020 at 5:52pm

Could be an endless list of things. I suggest having a competent tech look at it. The AM and the FM section only share the power supply/audio output.

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Permalink Reply by Norman S Braithwaite on August 24, 2020 at 6:36pm

In many cases the trimmer capacitors in square boxes under the chassis become loose from the variable selectivity shaft and can 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 a grid circuit has shorted to the stator section. If it were in the plate circuits, the 1K plate resistor would have let you know (the originals blow up emitting smoke).