Friedman/Suhr PPIMV

[physics]

Hi!



I was wondering if anyone had any thoughts on the "new" master volume that Friedman and Suhr amps seem to be using, as seen on the Plex and SL68 amps. Bias grid-leaks are replaced with 2M2 resistors, and each resistor gets one gang of a dual gang pot (each gang wired as a rheostat) in parallel with it. As you turn down the pot, you reduce the grid-leak value and load down the phase inverter, or such is my current understanding.

I'll post a sketch after some sleep.

Thanks,
          physics

Edit: sketch