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I'm very interested in how noticeable the differences are in the clean channel of a Mark IIB compared to a Mark III red stripe. I have a IIA and am wondering if I should go for something else as it's pretty dark. Any thoughts from people who have or have heard both?

I think I saw this here someplace but I can't find it now... Can someone list the various models that correspond to board changes for the Mark II and III lines? Like did the board change between MkII and IIB? IIC... III blue strip to green stripe, etc?

Is there a mod, or does someone at Mesa maybe do a conversion of the SOB to a Mark I specs?

Would a Mark IIA chassis from a combo fit into a Mark IV head shell without altering anything? If not what would need to change, if it's possible at all?

One's on the way! I think the subject pretty much says it all :mrgreen: But just in case, I'm only interested in the "plus" ones with a graphic EQ.

I've seen the studio .22s referred to as light weight, grab n go, etc., and I'm wondering what they actually weigh. Is there a spec sheet on the web someplace? Or maybe someone has weighed theirs and could post the weight?

Thinking about getting a head cab for chassis currently in a combo, and in that cramped space I assume a fan makes a difference. At least my old MkII head had one. But on a MkIIB with an export transformer there's no power jack like on the regular ones, at least based on pictures. When you add...

I just got an amp dated 5/19/80 on the underside of the chassis, not sure if it's a IIA or IIB. 100/60, reverb and EQ. S/N 5206 The underside of the chassis has a metal plug where the FET switch by V1 is that I saw in a thread here about an amp from january of 1980...

I was playing a gig Saturday night and half way through the night it seemed like my 2nd channel was ridiculously quiet. Later on I noticed that with the reverb off the 1st channel too was really quiet. If I kicked on the footswitch reverb on either of the channels the volume was back as...