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...and how can I tell if that was done to my Mark IIA? I bought a Mark IIA about a year ago from the original owner. It included a bunch of original paperwork, brochures, price lists, magazine reviews, etc. Interestingly, it included manuals for *both* the Mark IIA and the Mark IIB. The seller...

I just bought a Mark II I'm pretty certain is a IIA -- preamp-out/power-in and slave out on the back instead of the fx loop of IIB and later, and a serial number in the 4000s -- but all the literature that accompanied it is all about the IIB. I just bought it from the original owner. He had the...

I have a Mark I combo. When the master and overall volume is high, there is a microphonic howling feedback which occurs, independent of whether an instrument is plugged in. It doesn't happen if I unplug the internal speaker and use an external cabinet. I've tried swapping out preamp and power...

Wondering why some stompbox effects sound just fine in the FX loop of my Mark IIB and Mark IIC+, and others don't? Specifically, a Boss CE-5 chorus, PH-1r, PH-2 phasers, and a Malekko Echo 600, all sound fine and dandy through the FX loops of these amps, while others, such as a RV-3 Reverb...

Hi, I bought a used Mesa 1x12 combo cab thinking I could mount my Mark IIB chassis in it. It turns out the mounting screws required for the cab are much narrower than those for mounting the amp chassis. Is there some special hardware required for mounting this that I don't have? The cab is a...

[This is a repost from the Gear Page, but it was recommended I share it here] Craigslist find, seller turned out to be a friend of a friend. This is a 1965 Fender Princeton modified with a Vibrolux output transformer, and a push/pull volume knob which shifts the bass response. Pushed in, it's...

Last night I had a Fender reverb unit plugged into the courtesy outlet of my Mark IIb. I had been doing a sound check, everything sounded fine during the check. I turned the reverb unit off, and immediately there was a pop and faint smell, the amp powered down and so did the reverb unit. When I...

I've owned a few used Marks now... a Mark I, IIb, IIc+, and III. All of them sound best when the bass EQ knob is set very low. Does anyone use these amps with the bass set high? And how do you have the rest of the amp set? What kind of music/environment/application benefits from this? Just...

I recently bought a Mark IIb head which has a mod done to it: there's an extra gain knob in the rear, where slave out would be. It combines with the master on the front somehow. I just don't have a clear mental model of what the mod does or how it affects the tone overall... short of fiddling...

Just wanted to say I got lucky a couple months ago and scored a IIc+ combo for a pretty good price. Got even luckier when I got it to the studio and found that it's not all hype and in fact a beautiful, inspiring little tone machine and perfect for one of my projects. Not metal! despite its...