Andy Bowman at Vintage Tube Services. Tough to get a hold of, but absolutely the best in the tube biz.
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If you want regular modern production tubes few people match Jim McShane he is on AA's tube asylum as a dealer, Also Brent Jesse he has great service and more NOS. I also like Tubemonger.com for NOS very honest good knowledge base. What ever you do there is virtually no good reason to spend 3X the usual cost for factory supplied replacements if you use a dealer who really tests the tubes. The ones I mentioned really do. If you can bias your all set. There is nothing magical about it the good dealers reject the bad tubes also.