Highend, I've had troubles with "the California guy" also. I'm not sure why so many people mention him. He's a flake and will outright lie to protect his ass. I lost over $500 in repair and shipping charges due to a VERY bad tube failure the first time I installed it. It was supposed to be a "premium" tube (tighter measured tolerances...). He denied that the tube could have caused the problems and then quickly sent a new tube to the mfg "free of charge". Also, my friend bought some NOS Tungsram E88CC's and they were not NOS tubes (nor Tungsrams for that matter). Now that is gall!!! I hope others figure this out.
Tubes & Audio Research Corp.
When Audio Research ships a set of tubes, they have them individually marked to match a certain area where they want you to install them. As long as they are the same type of tube does it make a difference which tube goes where? Are you better off buying replalcement tubes through Audio Research and pay 3 times the normal price for them for the testing they do?