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I have a few reservations about using a multigrid valve sitting on a common cathode CCS. THe g2 curents will do some screwey things. Rig the valves up as triodes and it goes away. Or use single-grid triodes.
I raised this issue with Allen Wright( I think, memory not what I remember it being a while ago...). He had a KT88 amp with a CCS in the cathode circuit, and noticed the same thing, g2 stuff doing screwey things.
It is a PP amp, make no mistage about it. Rigged with the high gain 6336( 6528?), I suspect a really neat amp, capable of 15 watts would be possible. It would take a bit of drive voltage, and 10x the g1-a capacitance for that valve is no joke...
regards,
Douglas


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