You didn't here but used R133 and C199 instead: https://proaudiodesignforum.com/forum/p ... 8&start=10
In the P10 no local Cfb but some inductance in the C2/C3 might have helped along with low output capacitance in the JFET: https://proaudiodesignforum.com/forum/p ... amps#p1244
In the P100 there is an RIAA network: https://proaudiodesignforum.com/forum/p ... 151&p=1625
Anywhere else I can look?
If the transistor output capacitance is low a local Cfb may not be needed.
The ZTX851 is about 45 pF IIRC with the PNP even more.
It would seem to follow Cfb would at least have to be that big.
When I use square waves, or look at something in the time domain as I always do, people laugh at me.
What do you short that blocking capacitor out with? A screwdriver?
Getting the charge out of it without welding the relay contacts or adding Rsource is not trivial.
I did one where I had the relay simply switch between a capacitor-coupled path and a direct path both fed by the same tip and ring.