I have an old 70's Super lead that is a gain monster, even on modest volume settings. Lately, I' been working on getting my Russian Big Muff to work with this amp and it has been very challenging to say the least but I'm finally there with single coil pickups, amp volumes set less than half way & and an Overdrive pushing the big muff to EQ the sound so it's not muffledbut cuts through. I just put, I think, a 12AY7? in V1 to tame this amp a little so the Big Muff has room to breathe so to speak. It seemed to help a little. So If I put say a 12AU7 in all three pre-amp slots, what would the amp sound like, a clean Fender sort of? Bottom line is that I'm trying to clean this amp up so it's more distortion pedal friendly. I played this amp cranked on 10 with various attenuators & no drive pedals for half my life & I want to go a different route. I like having to step on a pedal for distortion / FUZZ istead of the cranked Marshall sound. Tired of it. Anyone else try lower gain pr-amp tubes in there Super Leads?