MESA/Boogie® Mark IIC+ full demo & overview ft. Doug West & Tommy Waugh

  • Thread starter Thread starter JohnnyGtar
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So my tone with this amp was pretty bright right out the box setting it up without listening just with my eyes. I attribute it to the pickups in the guitar which were the Duncan Full Shred. Those things can be very bright. I just pulled the deep pot and that helped. Plus I had one of the bright pots pulled out.
How does the full shred compare to an SD or JB?
 
So the question is do the OG ones have the squeal as well? So far some people say no, others yes.

Maybe there will be a mod around this problem.
I am just wondering, if the people at Gibson were aware of this problem or if they just kept playing "dad rock" while testing the amp. In the end, it is a money grab for the company, so redesigning the product at any stage of the development would have cost them money and time.
With the lead ch gain at 8, and Vol 1 pulled/Dimed, Treble pulled dimed yes, absolutely with every one of my 4 (SRG, HRG, HRG ++, KRG). That's why I'm not up in arms about that clip or description. With mine, the gain at 4-5 was more than enough. No feedback for me.
Gain at 7,8? Yep. Squeal city. Now, if I dropped the vol 1, and treble it would diminish but my best settings were with those 2 dimed and pulled.
I lost a good bit of the clean ch that way but, who needs a clean??
 
If you by gain boost mean the pull function on the Master 1 knob that is actually the same as the pull deep. Gain boost is just what the old IIC faceplates said, the function is the same.
On the IIC/+ yes. As I understand it though on the IIBs, where the Gain Boost plates came from, the function was different. I don't recall the specifics though.
 
It’s audible at extreme settings but still present in the amp at above 20KHz in non-extreme settings. You’ll find this amp will eat tubes pre and power until it’s resolved. That fuzz you hear in the topmost frequencies in the gain is caused by instability. The amp needs recalled and fixed.
FWIW my JP2Cs esentially did this same thing, and they were RCS designed. it's possible this is a factor of modern things and not this amp specifically?
 
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I made a similar video the other day, linked below.

Working on the comparison this morning.

@pipboy90 is coming over this afternoon to check it out and bringing his Mark IV. I'll try to get some in-the-room clips while he's here too.



I know. See post #511. :-) I love your videos, man. You really do a kickass job on them!

Let us know what you guys think!
 
FWIW my JP2Cs esentially did this same thing, and they were RCS designed. it's possible this is a factor of modern things and not this amp specifically?
My Electra Dyne does this squeal, but my Rectifiers do not. The Mark VII does at some point also. Not sure on the JP2C, need to set that one up again soon.
 
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