Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on December 06, 2025, 09:14:08 am

Title: I think I had an idea for a "new PPIMV" that represent a Constant Load for PI
Post by: kagliostro on December 06, 2025, 09:14:08 am

Previously I was thinking to use a pair of SF using two mosfet, one for each brench of the PI but this thing seems to be way simpler

the difficult thing was to find a 4 ganged pot with the correct resistance value, but it is on the market

the idea is an L-PAD/PPIMV

(https://i.imgur.com/wSt1ldM.jpeg)

Franco

Title: Re: I think I had an idea for a "new PPIMV" that represent a Constant Load for PI
Post by: acheld on December 06, 2025, 10:22:18 am

I like the idea but am skeptical that the pots would be so precise.   But maybe they are.  I guess linear pots would be close enough.

Interesting!  Let us know how that works . . .

Title: Re: I think I had an idea for a "new PPIMV" that represent a Constant Load for PI
Post by: kagliostro on December 06, 2025, 11:01:30 am

For that use the pot must be Linear, not Logaritmic

Franco