Hey Dan...demo unit?? Shoot, I purchased it sound unheard!! This is mine..:))! So, I guess I can play around all I want with the tubes. The original owner (real nine 'goner) had Semins in the 6922 spot and Dynaco in the 12AX7 spot. I believe the 12AX7 is the more critical? What tubes do you use, Dan?
Rick
Rick