I came across a Peavey Rockmaster Head from the late 80's, (4) 6L6 and 12ax7 preamp. Does anyone know if this uses the same or similar preamp as the Rockmaster pre-amp?
Not the same by a mile. The Rockmaster head was my first tube amp, and needless to say didn't last long. Very low to mid gain rock amp, I think a precursor to the Butcher.
The Rockmaster preamp is nearly identical to the Ultra Plus preamp section.