Hi Bob, I must apologise for missing your forum entry…..
Did you buy the P10 direct from us? if so, then I need to get it back and fixed immediately.
It is possible that incorrect law pots were fitted… and I missed it on test, but I’m surprised at the phantom power problem!
I would not like to alter the EQ; it closely matches the 80B EQ and does not like value changes.
The opto devices do vary with time and I do spend quite a bit of time selecting….. but, and this is a bit of a trade secret, the most important thing is the proximity of the LED to the light cell; altering that can correct the imbalance.
email me direct for the circuit diagrams.