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I had (still have) a radio that will drop in volume all of a sudden. I believe it has a bad tube socket - one of the pin connections is intermittent - OR it could have a bad solder joint that is sometimes OK but other times not, OR a resistor that reads OK when cold but drifts or opens up when it gets warm. Among other places I would also look around the AVC circuit if there is one, and make sure the resistors there are OK.
Is it constant or intermittent?
Have you swapped tubes out in spite of the fact that they read OK? If it does it regardless of what tubes you have in it, it is not the tubes.
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