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Eric:
Sound take off coil, discriminator transformer and dirty/broken tube socket pins are the most frequent offenders. Sometimes you can squeeze the pins back in with a sharp, pointy tool like a dentist pick. The tubes plug in through the bottom of the socket so replacement sockets must be exact.
The sockets connections would get hairline breaks between the tube contact and the PC board pin. Impossible to see, but an ohm meter check will reveal a bad one.
Don
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