Got this in a trade yesterday. It's a Peavey "Rock Master" head, not to be confused with the more recent preamp of the same name. 4 x 6L6GCs, 3 x 12AX7, 120W of output! Talk about clean headroom... Anybody else used one of these before? It's a pretty basic amp, one and a half channels really, but it does do a very a neat switching trick so it's like having two channels! It has 3 gain controls, labelled Pre, Pump, and Post. Basically two preamp gains and a master volume. In the Clean mode, the master volume/Post is always set to 10, and the "Pump" is out of the circuit, so you've only got the "Pre" control. Loads of clean headroom! Hit the footswitch so you're on the Dirty or "Pump" setting, and you've got all 3 knobs again. The "Pre" doesn't really do much on this setting, however. It's easiest to think of it as two separate channels, with "Pre" being the clean volume setting, and "Pump" and "Post" being the dirty gain/volume settings. EQ is typical 3 band, seems to be passive TMB style, with Presence control. The only other feature it has is an effects loop - not switchable, and it's TRS jack so you need a splitter, but useful for accessing the preamp feed, or using the power section with another preamp. I've attached a picture - is it just me, or is the output transformer rather large? (I've never owned an amp that's 100+ watts before, so I don't know what goes for "normal" as far as output transformer size) Wouldn't be suprising, since Peavey amps are in my experience built like tanks... I do have the cabinet, but it's nasty and being cleaned. Plus I want to make a custom front panel for better ventilation. I already cleaned the chassis, though, so I can show you that. Looks to have all-original tubes, Peavey labelled. The power tubes are actually Sylvania/Phillips STR-387 tubes - I just looked them up and realized they're pretty desirable. I could probably sell the quad for quite a bit more than I've got into the amp so far... but if they sound so good I might as well keep 'em, right? Anyway... just wanted to share the new toy!