A quick and easy method is to install an in-line attenuator between your pre-amp and amp. There are typically classified ads here on AudiogoN for a Rothwell 10bd in-line attenuator. I've never used them, but the subject comes up often and I've read that they don't seem to have a negative impact on overall sonics.
Personally, I would prefer this method to modifying the circuit. I wouldn't want to do anything to the unit that may damage it or lower its resale value.
Enjoy,
TIC
Personally, I would prefer this method to modifying the circuit. I wouldn't want to do anything to the unit that may damage it or lower its resale value.
Enjoy,
TIC