by Smolder » Tue Mar 20, 2012 3:53 pm
The metro amp's forum has extensive discussions about post phase inverter master volumes. Search for PPIMV. I converted a twin a while back. 10 bucks worth of parts if you buy the kit from meto. It's a pair of 2.2M resistors, a dual 250k pot and one sheilded wire. It works very well (like most things, in moderation).