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.
Done!
Enjoying the music... Feedback wires going from speaker posts were causing capacitive coupling with something nearby. Moved resistors to the posts, now both channels are stable.
Well; fast amps should be treated as carefully as radio transceivers! 😀
5 watts aren't gonna happen with the single 11W tube.
You can do that with two 6S19Ps in parallel, but it'll require pretty non-standard OPT (Ra ~ 1..1.2kOhm, Ia0 ~ 130mA)
