I see that the amp has 2 independent global feedback loops, the second one leading to the vol pot at the input also providing RIAA equalization.
You may try to ground the junction between C3 and the 2200 Ohm resistor to deactivate this loop.
Also lifting C2 would increase treble and probably gain.
Edit: If the amp is going to be used with guitar only I would remove the filter components at the input, change the vol pot to 1M log and add a 47pF to 100pF bright cap.
You may try to ground the junction between C3 and the 2200 Ohm resistor to deactivate this loop.
Also lifting C2 would increase treble and probably gain.
Edit: If the amp is going to be used with guitar only I would remove the filter components at the input, change the vol pot to 1M log and add a 47pF to 100pF bright cap.
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