"I've been buying new and NOS tubes for about fifteen years from almost all the vendors currently in business and overall my experiences have been good with one exception; Upscale Audio.

I bought six gold grade Matsushita 7DJ8 tubes from Upscale, graded A for both noise and microphonics for my Herron VTSP-3A line stage. Five out of the six were noisy and one was so microphonic that speaking at normal levels would set it off. The day after I received them I contacted Upscale using their website messaging system (the unanswered message is still there) requesting an exchange or possible upgrade to platinum grade if those would be quieter. I received no response. Two days later I emailed them with the same request. No reply. I then requested a RA so I could return them for a refund. No reply. A week later I filed a dispute with Visa. Upscale is fighting it.

I've heard similar stories. There are many good tube vendors out there so I would recommend any others before considering Upscale Audio. In addition, I think their tube descriptions and superior testing claims are generally exaggerated.
"