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To add to what the other guys have said, honestly, Mark II and III reverb sucks. It's not worth upgrading to it, you're better off without the extra bits in the circuit & just get your pedal of choice. The mod that IS worth doing is the loop mod, so your loop becomes good, and then your loop...

That would be hard to do because they are soldered in with hard wire. I suggest taking it apart, verify all your connections & signal paths, make sure none of the bare wires are touching, verify your speakers, then just trust what it says.

Here's one thing y'all are missing, & I do not have an answer for why this is. I have 5 or 6 Mesa 4x12s with the stereo back plate and I can NEVER get a good, repeatable ohm reading on the jacks with my DVM unless I fresh hose everything down with Deoxit (and then it improves to "sometimes")...

I believe what the OP is asking is for a mod to change his amp from fixed to adjustable bias. I don't have it. Honestly this is the one change I wish all my Mesas had.

Here's #41 in action if you're interested. Best Recto tone I've ever played. Mic'd- Live-

The M180 / M190 is the power section from a IIC+ Coliseum in a rack. The Strategy 400 is a pair of Mark III Coliseum power sections in a stereo rack.

Luke did indeed tour with a pair of IIC+ Coliseum heads- which recently sold.

My Mark II Coliseums (B+ / C+) are still the main amps for my band. Nothing can touch them live!

If you don't want to spring for high dollar, old, questionable 415s, there are modern alternatives for the high PV amps. - JJ / Mesa STR445 - TAD 6L6GC-STR - The Tube Store Preferred Series 6L6GC-STR (essentially the same as the TAD)

Hey there, Nice find!! I also highly recommend sending it to Mesa for service. I've got a FB group for Coli owners. Feel free to join us & put your questions up there. :) https://www.facebook.com/groups/541836403508428

The serial loop units with the RR-1D board I'm told are the same circuit as the Rev F Rectos. You have some darn early serials there, what board revision do they have? I have a very early parallel loop Tverb #354X and it has the RR-1E board. It's a GLORIOUS sounding amp.

Which one? 100, X101, 105, Super 60 or Coli? They're all different height. (though I don't own any of them anymore except the Coli.)

I've owned 6 IIC+ and 7 III, all the options, and I will say that the 60s are my favorite to play. They are pissed off!

What MisterMojo says. You need to pull the chassis & see what's written on its side. There should be a chassis code in sharpie that will tell you. Also highly agree with having Mike B. at Mesa service it while you still can. Ignore the wait & the cost, the window of opportunity will close...

Yes, it sold.

I've got my Rev F blackface Triple available for $3600. https://www.rig-talk.com/forum/threads/wtb-mesa-mark-iii-coliseum-would-trade-for-my-blackface-triple-rectifier-rev-f.223415/#post-2475605

I've got my Rev F blackface Triple available for $3600. https://www.rig-talk.com/forum/threads/wtb-mesa-mark-iii-coliseum-would-trade-for-my-blackface-triple-rectifier-rev-f.223415/#post-2475605

Oops. I don't remember exactly, but it was right around 450pv. The JP2C transformer was more or less the same as the X101 in both dimensions & performance.

I'd suggest focusing on an amp as the sum of the parts. For example, of all the C+ I've had the HRG with the X101 was my least favorite. It had the weakest gain. Don't get hung up on the soup, focus on the amp as a whole. Some are just better than others. I've had 6 III as well, and except...

Not by me, but I know who has it & it may be. PM me if you want me to put you in contact.