Friedman/Suhr PPIMV

[physics]

In retrospect, I see how post #3 was confusing. Sorry. To clarify, it was intended to describe one of the DC-coupled designs in TUT4. Here is my description reworked:

The F/S PPIMV looks similar to the design you put in TUT4, which has the pot wiper to top of grid leak, the bottom of the pot to -Vb, and the top of the pot to the PI coupling cap. Both your design and the F/S design are strapped across the grid-leaks.

Thanks for the additional info in post #4 Kevin. To your comment about changing bias voltage being a bad idea, am I correct in saying that the F/S design messes with bias voltage since it varies the grid-leak values, and thus it's not ideal?

Thanks,
physics