I had a Rockmaster preamp and the Peavey 6L6 power amp many years ago. One gig and it was gone. Not my thing. To me it was shitty.
The Rockman was super cool back in the early/mid '80s. But you only get that one tone. That worked for some bands at the time, but I can't imagine anyone using that tone today.
Sorry man. Didn't mean to shit all over your opinions.