You could try Roger M. at Music Reference . I believe he was the desingner of the internal Amps
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There seems to be a lot of confusion about Modjeski's part in the manufacture of Beveridge speakers. The direct drive OTL amplifiers in the Beveridge Model 2 were actually Counterpoint amplifiers. Modjeski was involved in building the solid state amplifiers for the 2SW-2 subwoofers. If Rick Beveridge is still restoring Beveridge speakers he is your best bet.
What is the problem with the speakers? Is it the amplifiers or the panels? I have the same speaker and might be able to steer you in the right direction. I have spoken to Rick a number of times and I don't think that he will be repairing panels soon unfortunately. Roger M. is an excellent recommendation. I actually spoke to him today about this issue. email@example.com. Bob
From what I understand, the panels are fine. He is getting a buzzing or whining sound from one of the amplifiers. I suspect something has gone out of tolerance and the amp is oscillating. To clarify, the whining is heard through the speaker panel and its not mechanical vibration from a transformer, etc.
He does not think its 60/120 Hz hum.
He was going to call Rodger M to see if he could help. From what I understand Rodger is selling tube amps and perhaps he has some familiarity with the earlier Beveridge designs.