Octal based "universal tone test-bench" (power) amp

[roberto]

I don't want to go with quads, just pair of output tubes.
Output RMS will vary from 15 W of the 6V6s, to 40-50 W of the EL34/6L6GC, up to 80 W of the KT88/6550s.
But of course everything can be scaled if you want to.

[didit]

It is not possible to get 200 Wrms from a pair of KT88 in push pull.
With maximum 500V B+ you can get around 80 Wrms.

That's absolutely true. However, I'm confident one can get sparkly dry 100W from a pair in AB push-pull. Requires solid 600V plate supply and a fairly high primary impedance output transformer.

Best .. Ian

[roberto]

560 V on plates and 300 V on screens are enough, and the load is around 4 kOhm:
https://frank.pocnet.net/sheets/086/k/KT88.pdf

But with here I’ve foreseen up to 500 V only for plates.