Fender wattage - 50, 85, 100 - is there for headroom. Yeah, they are LOUD - but they also sound amazing at reasonable volumes. They are clean amps. The goal of a high wattage Fender isn't power tube crunch, it's to have an amp that stays CLEAN as the volume increases. It's how Leo designed them. Using an attenuator on a powerful Fender kind of defeats the purpose of why they were designed. It's sort of the opposite of Marshall or some of the others that you WANT to crank to get the goods. Sure, Deluxe Reverb on down have great drive when pushed. IMHO, a Twin sounds HORRIBLE when cranked. I have done it. It was pointless, lol. That amp was meant to be clean. You can get some GREAT crunch out of a Bassman. An attenuator would benefit that one, for sure. But, again, it sounds great clean at reasonable volumes. Bandmasters and Tremoluxes are cool too - they cam give some range when pushed, but also follow the standard Fender idea - "distortion is bad". To answer your question about the wattage of the Super Reverb and the "classic" Bassman 4x10 - 45 watts. The Blackface and early Silverface Bassman is 50 watts.