The normal tube was El34 for this amp
I realize it was originally running EL34, and there are some things I'm not completely understanding about this amp:
- The small tube sockets are all ceramic, all photos show the brown plastic
- The input/output jacks are all gold, all photos I see show gold on Phono and CD only
- The inputs are arranged differently than in photos.
- What changes were made to accommodate the 6L6GC?
The original owner took this to the Audio Innovations factory, at which time they performed significant updates/upgrades, some at no cost. Specifically mentioned is a power supply update and an update to the phono preamp. I don't know if anything such as sockets and input jacks were changed at that time. It is an early (4, 8, 16 ohm outputs) amp. He also had done some things with an outfit called Border Patrol who did the 6L6GC change I understand. He gave me some documents from Border Patrol with the original manual.
At this point it sounds great, it embarrasses some of my higher-priced equipment, and I can't argue with running tubes that are lower filament current to keep the power transformer cooler. I would like to know all that was done other than that documented in the schematics dated Sep 2000, at this point my only option is to compare the original schematics and photos to the 2000 ones.