I had problems with the guy on the phone. Your info for the 6fq7/6cg7 states that you have become a STAX dealer. He stated to me that he was looking at the sight and that you aren't a STAX dealer. and that the info about about those tubes doesn't say anything about being a dealer. STAX told me to contact my local STAX dealer for info about repairs. I have a STAX SRM-T1 serial # B4471. Was able to find schematics for "NEW" STAX from #4881. Is it possible to obtain the correct info from you for my amp? Please have the sales man read all of your info before answering the phone. He was insulting insulting. I am loving my Marantz Ken Ishiwata SACD player. Perhaps the very best music playing piece of equipment in the world? Ken gets to the Heart and Soul of Music!!! Best, William