It is not worth 3 times what they want.I would stay away from the California guy.Been stuck with some bad tubes as have many others.I f you have let others now.Try www.vintagetubeservices.com
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?