Tube vendor recommendations?

RAM Labs for me too. Roger Modjeski has a vast knowledge of tube design, construction, and performance parameters, as well as amplifier circuits. He often provides tubes to other amp designers such as Mike Sanders (Quicksilver Audio) and Ralph Karsten (Atma-Sphere).

Jim McShane is fantastic and can be highly recommended. It’s a shame that his web site looks like it was kludged together by a six year old child who had been drinking black coffee all morning.

Thanks for these suggestions. 

Another vote for Andy at Vintage Tube Services. Always nice, honest and reliable, and great, well tested tubes.

It’s seems as though Andy and Jim are popular choices here. I know that Kevin at UpScale prefers to serve his customers. Two of the products I need tubes for came from my being one of his customers. That said, I’ll likely call Andy or Jim first.