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I've been on the fence about selling my Mark IV, but a few unexpected bills rolled in and the tax man is just around the corner so... The amp is in very good condition, a few tolex scuffs here and there. It has a re-coned EVM-12L in it, new JJ 6L6/E34L power tubes, castors, and footswitch. The...

I'm with Zeppman on this one. To me there's not a big enough difference in sound between new production or NOS power tubes to justify the cost. I have found that pre-amp tubes are another story! I have some old Mullard and RCA 12AX7's that I use in my MK IV. I've noticed a big difference...

I just replaced the Classic Lead 80 that was in my MKIV with an EVM12L. I found it in a local shop that just did a recone on it. First let me state that I really like the sound of the Celestion, but I felt that it was muddying my sound up. My initial thought was that the EV has a little more...

I bought a used Mark IV back in March and it had a Mesa 12AT7 in V2. I think the previous owner did this to bring the gain down for channel 2 for a bluesier vibe. I had a few old RCA 12AX7's and stuck those in instead and to me it sounds warmer. I did get a couple of those Mullard 12AT7's. I...