WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
Building, troubleshooting and testing of these amplifiers should only be
performed by someone who is thoroughly familiar with
the safety precautions around high voltages.
What do you thing? The general idea is to use ax7 half for gain stage and au7 half for cathode follower which is more fit in for that approach. The concern is to low current for au7 half than.
The concept of CCDA is based on the principal of dynamic balance of the two halves. Easy to do with same tubes and same loads. It would be tricky to match AC performance for different tubes, I think...
