pass F5 superturbo with 10 pairs of output mosfets?

[rhythmsandy]

what If I want to use about 10 pairs or 15 pairs of output mosfets for the F5 which driver transistor is capable of driving them as large aggregated input capacitance.
consider total idle current per rail about 2Amp at 51VDC per rail.

 

[Zen Mod]

I would go with either source or emiter followers in between FE and OS , but fine-tuning of said iteration is not for faint at heart ........

your easiest bet is to double input JFets , halve drain resistances and that's it

stay with up to 10 pairs in OS

 

[6L6]

Or build BA-3 complimentary and use that many output MOSFET.

 

[Zen Mod]

though , it needs some tweaking for 51Vdc rails

 

[6L6]

Oh! Didn’t notice the 51V.

Yes, that would need a cascode over the Jfets.

 

[rhythmsandy]

but is the driver sufficient to drive those many mosfets? what is papa using for the X series amp? I believe toshiba mosfets.. some J132 or any other ones. I also read somewhere that papa says its better to driver mosfets with mosfets than with transistors as mosfet drivers sound good with mosfets.