I cant get a 'clean-clean' roll off on mine. It gets cleanish with a strat. Still has some bite to it though. I used it for a number of cover gigs with a country-folk kinda band (obviously the wrong amp for this but whatever) and by the end of the night once it was good and hot there wasn't much clean left.
I love my PT-20 and its all the clean I ever need for my original stuff. Rolls off for great hendrixy stuff (especially with a Uvibe)