Scott, just a thought for the next time. I am not an electronics tech, but many members happen to be. Perhaps one of them will jump in.
It is my understanding that ARC, and perhaps many other manufacturers, recommend using matched tube pairs for their amps. And this is where the experts can chime in ... matching entails more than just buying tubes which happen to bias closely. There are other electrical attributes that are taken into consideration when matching tubes, for example, transconductance, G2, resistance, microphony, and so forth.
I really do hope one of our other experts will jump in now. So my point is that if my thoughts, as expressed in the preceding paragraph are accurate, that should encourage you to buy power tubes from reputable sources, such as ARC, or Upscale Audio, and the many other fine tube vendors out there.
Btw, surf through the Upscale web site. Uncle Kevin talks about his tube testing and matching procedures.