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Hi all, I've got a Mark IVb medium head that I bought used last year. Its an early B, I think around 1993, but seems to be in great shape. I've been building a rig around this amp as a hobby for the last year and have run into some odd behavior regarding buffers and the FX Loop. I'm running a...

Hmm, they may actually be red plating. They at least glow quite orange. I've typically (on weeknights), run the master super low so I don't get my neighbors all pissed off. So I've obviously been putting most of the work on the preamp tubes. This morning I just tried an experiment of running...

Hey there, I guess we have the same question that had been asked of me last week... How many functions do you need to switch on the Mark IV? And how many GCX loops will you have available? I needed to switch between R1, R2 and Lead+EQ, and I've been able to do this using only 2 loops on the...

Well, think my problem is basically solved, but in case anyone is interested here is my current state of gear for this rig: * Mark IV Medium Head * 2 x 12 Horizontal Recto cab * GCX * TC Electronics GMajor * Crybaby Wah * Ernie Ball volume pedal My goal was to get this gear integrated, be...

Getting a mini-amp gizmo or a used Axxess CFX4 would obviously be the most ideal, but this is more of a hobby rig than anything, so I was trying to not add any additional costs to it. If I needed all 4 GCX loops for now, that still would have been ok, just fewer loops for further expansion, and...

So it turns out that the tubes I had in the XXX were JJ KT77s, not actually EL34s. I read that this was also safe (I'm not 100% sure about that), so I gave them a shot, and they sound glorious. Thicker, bassier and more compressed than the all 6L6 set that I'd had in there. Of course this can...

Hey all, As mentioned in a post two days ago, I'm a new Mark IV owner. The amp that I got has all 6L6 power tubes, but I'm pretty interested in switching the outer tubes to the EL34s. My previous amp was a Peavey XXX combo, and had it tubed with JJ E34Ls from Bob at Eurotubes. So the question...

Hi all, I'm a new MesaBoogie owner and new forum member, so hi! I became the proud owner of a Boogie Mark IV Medium head back in October (the previous owner said that its a IVB from the late 90s, however I have my doubts as it doesn't have the detachable power cord, so its probably an early...