Not to pile on, but when I tried to retube a VT100 mk2 through Upscale they were rude to me also, but more importantly they were rude to my amp! LOL. Anyway, when I retubed a VT200 a couple of years later I remembered Kevin's, um, "direct"ness and ordered tubes from a Canadian seller. The tubes were supposedly Svetlana SED 6550C's like ARC uses, but the pins were slightly thinner... Anyway, one of the tubes flared, damaging the amp. So while the tube seller was happy to replace the tube, I had to send the amp to ARC for repairs which cost me about $700, mostly for shipping. So, I now have a Ref 3 and Ref 110, and I will absolutely buy my tubes from ARC.