I have investigated the transformer windings and recalculated them for LTspice..
With the original configuration
8k Ra
33%UL
10%Ra CFB
and GU50s, the voltage gain is basically 0.93. So this is beyond unreasonable as I would have to provide a 1.2kV P-P audio signal for each grid. nu-uh.
There are to ways to go about it now, either reduce the CFB windings or delete them alltogether, And I think deleting it alltogether will be the smarter way to go about it as the GU50 already has an obismally low gain,
With the original configuration
8k Ra
33%UL
10%Ra CFB
and GU50s, the voltage gain is basically 0.93. So this is beyond unreasonable as I would have to provide a 1.2kV P-P audio signal for each grid. nu-uh.
There are to ways to go about it now, either reduce the CFB windings or delete them alltogether, And I think deleting it alltogether will be the smarter way to go about it as the GU50 already has an obismally low gain,
think I can easily pull out 100W RMS out of a single pair.
112W
This is for 75W, THD less than 0.1% at full power (simulation):
For 100W incrase B+ tu 550V-580V
For 100W incrase B+ tu 550V-580V