Tube Dealers 2021

Brent Jessee Recording is my go-to, for rare, NOS, 6SN7 Octals.    I've gotten some of my very best NOS, nine-pin miniatures (especially, my Siemens), from this seller, in Germany:   https://www.ebay.com/usr/audiotubes_de?_trksid=p2053788.m1543.l2754          I've never been disappointed by either TC Tubes, or Upscale Audio, when it comes to NOS or new production power tubes (6550, KT88, EL34, etc).        https://tctubes.com/          TC Tubes surprised me, when one of an octet of GE 6550s went bad, after almost two full years of service.   I returned the set to them and they ID'd the offender, found one that matched the remainders and gave it to me, gratis.     Hard to beat that kind of customer service.