Let's see: Nashville, the home of country music recording with all those tube guitar amps? Maybe you should try calling the local music stores. I am sure they can direct you to a good tech who knows audio also.
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That's strange as I just googled tube amp repair and lots of listings came and yes, most of them are guitar amp services and on a look up of high end stereo shops brought up a couple. One would think that in Nashville, of all places, there has to be someone who can repair your amp.
Good luck and
all the best,
There is a small company here in Chattanooga that specializes in tube design. Daryl has repaired many many tube amps (including Audio Research, Cary) that have been written off by the vendors service department as unfixable. He seems not to require schematics, which is helpful, as they are not always available. Try looking up Digital Phase in Ooltewah (just outside the Chattanooga city limits).