EWBrown wrote:Parallel SE KT88s might achieve 20 watts, use an OPT with half the normal plate load impedance for a single tube.
The new KT-150 is "almost" equivalent to two paralleled KT88s.
Just a SWAG....
/ed B
And MUCH safer than the normal way of getting 25 to 35 Watts of SE Sound - An 845 at +1350 Volts (i'm finally tackling one of these
BUT
1) I've been an electonics apprentice => tech => engineer over 40 years
2) I've been designing and building tube gear for 20 of those years.
At these sort of voltages you can get caught out by something as simple as your multimeter probe wires not having enough voltage rating.
Parallel KT88 will cetainly get you well over 20 Watts, unfortunately none of teh dat sheets I've seen tell you anything except various modes of Push Pull Operation.
Parallel 6L6GC are reported to give 22 Watts. AN Ozzie electronics magazine did a parallel 6L6GC SE project - it was called teh "Mudlark" if you want to go looking for it. It used flourescent light balasts as choke loads on the output tubes and ran zero DC current in the output tranny.
Cheers,
Ian