I am upgrading my original ST70 to the VTA board I just ordered from tubes4hifi, along with the triode/pentode switches. It calls for the 12au7 tubes. I have been reading lots of great info on this forum for the past couple of weeks and have learned A LOT!
My question: I am seeing a lot of organ tubes for sale (baldwin, conn) and military spec tubes for sale on that auction site. Can anyone give me any advice regarding these (what to avoid or what to look for)? Also, do I want a matched triplet, or just a matched pair and one odd tube?
Thanks. I am sure I will have some more questions later.