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I'm not sure if this is the same thing you're referring to, but I know some of the later simul-class IIc+'s were described by Mike B. as "heinously bright." I had one of those, and he changed one of the caps. Called it the "brightness reduction mod."

I believe it is/was also referred to as "dual-class"

Makes sense. I'm wondering if the smaller coupling cap on the non-EQ's further accentuates this, or if the GEQ versions of the sixty watt versions are also noticeably more sparkly. Similarly, I had a Fuchs ODS 100 and an ODS 50; I kept the 50 for the same reason- tighter, more crisp response.

H= 100/60watt S= 60watt D= simul-class (75/15watt) R= reverb G= graphic EQ X= export transformer OG= (colloquial) original gangster OG refers to a vintage Mark IIc+, distinguishing it from the reissue

I had an opportunity to try a IIc+ SRX today (with an x101!). My current amp is a DRX. What struck me was the top end “sparkle” that I seemed to get out of the SRX when playing leads. I’ll never sell my DRX, but I’m intrigued about what flavor of IIc+ has the most top-end “sparkle” for lead...

Absolutely. And I think he was right (but for the wrong reason). The IIc+, as many pointed out, was not his "brain child." However, the reason I think he was right to not release a reissue was because, as many pointed out, it really cannot be "reverse engineered." It won't sound as open/organic...

I know I'm not the only person here (and I don't claim to be) whose spoken extensively with Mike B., but he absolutely strikes me as someone who prefers not to be in the spotlight. I am sure he declined any invitation to be in the press releases for these. And the more cynical side of it: he is...

I'm sure Mike B. is already getting calls about doing the "++" mod on it

I had one with a 9A preamp board that had the "pull deep" circuit (the way Mike B. describes the difference is that if you put T-M-B all on "0", and then pull "gain boost," the older circuit will suddenly jump from no sound to lots of sound. I believe it's the same idea with the dumble style...

Aha, a 9C pre-1000! I was wondering if that was the cutoff

I was just reading that thread the other day. I'm dying to hear it! Serious respect, brother!

All evidence (history of reissues) seems to confirm they sound different. Unless you have numerous examples I'm missing.

If it was so lucrative to make a Mark IIc+ reissue, then someone would be doing it already. Spoiler: it's not lucrative. We have our little IIC+ club here, but we don't have nearly the numbers or sway that many seem to think. More likely is that some niche amp maker or individual will decide to...

I'm super intrigued by what a IIc non-plus sounds like. I have a late IIb DRGX (RP9C board) and a IIC+ DRX. I love both. If the IIc takes what I love about both and combines them, I may have a task ahead of myself..

And if so, how long ago did you, and are you satisfied? My IIc+ is a DRX (non-graphic), and I actually find myself playing mostly without "pull deep" engaged. My aim in the most singing, vocal, harmonically-rich lead tone. I'm not in it for the tight rhythm crunch (I actually have a late IIb...

Hello, I'm wondering if there is info about exactly what serial numbers encompass these preamp boards: RP9A / SP9A RP9C / SP9C ...and any others, for the sake of having it all in one place. I know my serial #1015X has the RP9C I had a #8936 that had the SP9A

Wow, this hurts to look at! I'm not totally sure, but what you mentioned about the return jack leading to the final preamp tube grid might actually be present in Mike B's "loop mod" ("IIb+"). Good luck with this project! The original transformers are magic, so there are undoubtedly some killer...

My absolute favorite speaker is also the MS-12. I use it with all my Mesa Mark's and with my Fuchs ODS. I literally almost sold my IIb when I was playing it through an EVM 12L. I know some love that speaker, but paired with my IIb, it seemed to either add or bring out this gross/nasty...

Wondering if anyone has tried them & liked them in Simul Mark II's. Also wondering if they should stay in the bias range for what Mike B recommends for EL34's in the class A sockets (25-35 mA, I believe), and where to buy/how to ask for tubes that will get me in that range.

Right- although I bought them after several people recommended them for my Fuchs Overdrive Supreme... which has similar plate voltages.