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NFB - Single Ended Class A
I want to circle back onto this one...

Since there is no phase inverter like on a push-pull amp, what are the different designs and approaches for applying negative feedback to a Single Ended Class A design?

Looking to add a presence and resonance circuit to my amps.  Attached is the NFB/presence/resonance circuit.  I have not tried it yet.  Has anyone else?

I know on Fender's they just use a resistor and apply it from the 2nd gain stage to the OT and of course resistor value would depend on output transformer tap.  The reason I understand the 2nd gain stage is used is that the phase is inverted after each gain stage, so goes from positive to negative.  Is this so?


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