I also use 1 pair 12ax7 and 1pair 12at7. Thor (line stage) I purchased a pair of mullards 12at7s from kevin at Upscale Audio. Tubes marked 6201 mullard gold pins. Great base very nuetral also. I think they were about $60 pair. The other pair i purchased to compliment them were, Tungsrams 12ax7s. Good combo! About the same price per pair.good luck!
