[r8i0]

    Bill, you've got a lot more experience than I do so I doubt I can help much, but I feel your pain.  I've got an 84B that has a similar volume jumping around problem that I've yet to diagnose.  I've prodded for loose components; looked for cold solder joints;  cleaned dirty pots and tube pins but haven't located
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Good evening,
Earlier today I replaced the pair of 6f6 tubes with a pair of 6v6 tubes and the problem got worse. The bounce went crazy. Big highs and low lows. I am going to concentrate on the output for now and will report the results.
R8i0
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Well, I think that I finally found the problem. I decided to replace ALL the resistors in the radio and found that in an earlier repair they put a .01 on the grid of the 6J5 and the schematic called for a 110mmf. I replaced this cap and the radio is playing at a nice steady volume for about 30 minutes now. I'll play it for another hour or so and if it is still good I'll call it done. I will check the alignment again and then put it back in the cabinet. I will then try to send a picture of it completed.
Thanks to all who helped with this fix. Merry Christmas.