Chalie:

Looked at the link - I guess they still are available, I just hadn't heard from them for a long time. The input tubes they are using is the usual one for a lot of ST-70 mods. It is a combination pentode/triode that is an input gain and phase splitter in one tube, as was the original. The new one is better however. I actually hoarded a load of the original 7199 tubes before they bacame impossible to get - maybe I should sell them on eBay