It's not that exotic. I would trust it to any well-reputed tech near you.
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I had Tom at Brooks Berdan Ltd. work on my 25/25. But it was just replacing the binding posts with Cardas', and adding a simple r/c filer x/o on the input jacks---there was nothing wrong with the amp. Do you have a schematic of the circuit? Tom is a professional EE, and has worked on just about everything. Brooks had Tom do all his electronic work.