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.
I still beg to disagree to others who find the o/p tranny criteria to be so critical. The LF pole becomes critical due to the absurd values of original concertina interstage coupling caps....Morgan Jones Valve amps 4th ed, page 472.
Ditto here. With reasonable care and reasonable component and operating point selections (which you should use with ANY topology), I don't find it particularly unstable.
