Chocol8
Rock Star
- Messages
- 2,871
I'm no amp designer, it just seems odd to me. It's one wire that you could send anywhere. There has to be at least one amp out there that sends the NFB back into another part of the circuit. Surely?!
There are plenty of amps with NFB in the preamp. They take the output of a gain stage and feed it back to the input of that stage inverted.
To do that with the power tubes in a push pull amp would require splitting the NFB signal and inverting it for one tube. It makes way more sense to feed it back before the PI. But...it needs to come after any loops, tone stacks and other tone shaping in the preamp, and preferably after any volume controls. The only place that makes sense is at the PI input.
