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Jp2C has the same 'problem' as the mark V, the gain is fixed at about 5 internally, and they only give you access to the lead drive control on the front panel

Ground loops can be an issue inside the control cavity. Often there's a loop of wire that goes around all the pots and the output jack and pickups tacked to that at differnet places. Needs to remove the loop and give the ground a start and finish point

Interesting comparison. My favourite cab is a 4x12 with 3x V30 and 1 ET90. The ET90 just makes it bigger and better than the v30s alone. I tried a second cab next to it with v30s and one or two T75. The 75s are significantly quieter than the others and the cab overall sounds weaker.

Looks just like mine from October 81. Even a GE7 is just fine. But the mesa 5 band should be almost exactly what you would find in the amp.

I really like the 609 for capturing a sound that pretty closely captures a room sound or what my ear hears. As mentioned, it's not fussy with position - seems to have a wide cardioid pattern.

Looks like a JG2. The preamp circuit is exactly a jcm800 topology, but all different values. Then the rotary selector thing changes the tone stack around. The transformers and other hardware is good stuff though, no point fitting the wizard transformer. The power amp section is already regular...

10/10 wire shielding work...

Call me old fashioned but I'm still looking for something that can replace the M13 in terms of ease of use. It's so simple to set up, simple to adjust all the fx with the analog controls, simple to select any of the fx at any time with one footswitch

Yeah, 'real' IIC+ might not be an accurate description. But the price seems pretty reasonable. IMO this is a like someone modding something like a plexi into a 800. Still all marshall, all 800, but not factory release or upgrade.

It's not the loop mod circuit. I cant tell exactly what it is, but it's not a IIB or any of the known mod variants

You're forgetting how amps were built 30-40 years ago - electronic components tacked in wherever they will fit. A IIB circuit board while not providing a neat component layout could absolutely still be refitted into the C+ circuit with some period correct hackery.

I agree with you, pretty unlikely MB did the mod. But then again who knows what he might have done in the last 42 years since this amp was built. Mesa should have an official record of that amp/serial number so would be able to say if it had been in or not. The caps in use in the preamp aren't...

The circuit matters more than the PCB/component layout. I can see it's definitely not the IIB circuit anymore, assuming it is the IIC circuit (cant really tell), it's been shoehorned onto the 8B circuit board and retained the relay lead channel switching, no LDRs

I've tried the BE-OD through a slightly dirty jcm800 4210 clean channel. Honestly it was excellent, probably a mix of grit and boosting going on

Just add a line out to your amp from a speaker output. It's been mentioned 2-3 times now

All you need is a 25-100k pot, if your level isnt too high you dont even need that

yah was gonna say... red red black whoops :)

The problem with IIb's is the circuit was changing every few months. There's no consistency between amps or circuit diagrams for this reason. I have a loop modded, or whatever, IIB and it has about as much gain as my more modern marks, but it pretty wooly and vintage sounding. It's not very good...

Just replace the pot with a good one

Like this. The 220k can go over the two outer legs of the gain pot