Ben Jacoby at HEAR audio in Brooklyn. He is very good.
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If you don't mind the drive to Douglaston Queens check out Scott Gramlich from SG Custom Sounds. He has did great work on my Jolida 502P tube amp and even a vintage Accuphase E202 integrated some time ago and I've been happy ever since. Whenever I've visited him he has had older McIntosh, vintage guitar amps and sometimes ARC stuff in his shop.
Here is the info I found.
Best of luck
Thanks for the recommendations! It turned out to be two defective tubes that I tried sequentially, making me deduce incorrectly that the amp is defective. I called the first one, Ben Jacoby at HEAR audio in Brooklyn and he pointed out to that possibility. He also mentioned not to send the amp for repair before I made sure it is not the tubes, a very knowledgeable and honest person.