As long as we're geeking out on SLOs, let's share some settings. I'm not a real high gain player and I'm having some trouble dialing mine in. I rolled a bunch of tubes yesterday and ended up with 12AT7s in V1-V3. Anyone know what settings SRV was using?
All kinds of ways to dial it in.
The knobs change a bit, depending on volume and cab/speakers. It really likes Greenbacks, and needs some volume to open up. Not a bedroom amp.
At decent house-friendly volumes: For a general crunchy tone that cleans up with guitar volume and gets heavier with a boost, and a singing lower gain lead tone that gets into harder rock/80s hair metal with a boost:
Crunch channel gain 6-8, od channel gain 3-4.5. Bass 5.5, mid 3.5, treble 6.5, presence 7.5, depth 1. Depth above 1 adds a lot of low mids, if that's your thing.
That's at like 1+ on the volumes, or 1.5+ with the effects loop engaged and return volume at noon. Lower volumes need more presence to open up. Presence cranked, mids at 5, treble at 3 gets a more Marshally sound. Effects loop engaged sucks some mids and boosts some treble.
FWIW, I recently went back to China square getter and JJ 12ax7s in mine. Was running NOS RFT and Tungsram. Neutral, high gain tubes with lots of clarity lets the amp do its thing. It's all in the knobs and hands from there. Super dynamic amp that lays back or kicks in with pick attack.