Recent content by JCB1980

Rev A has the indicator lights on front. Rev B has no lights and has the square around the channel switch on the front.

The RP10 or RP11 can be upgraded to C+, so only the IIC can be upgraded. If a IIB has either of those boards it was upgraded to a IIC or IIC+ previously, most likely in the '80s. Most IIB amps have the RP9, which cannot be upgraded to IIC+ as it lacks the LDRs needed for the conversion

I feel like it is priced close to $3k too high. Also without Mike B. putting eyes on it I wouldn't trust that it is a C+. It is marked like a IICI, and dispite what anyone says, there were late IIC amps that would pass the loop test. I have one that I had Mike B convert to a IIC+ and it passed...

The first Mark IIIs had MESA/Boogie Ltd. It was during the Red stripe era that it switched to MESA/BOOGIE and then to MESA/BOOGIE MARK III So a Red stripe could have any of the 3 variations. As always Mesa used what Mesa had on hand so there could be some earlier or later stripes that have one...

Do you have a Mark IVa? That is the Revision that uses a 12at7 in V4. In the IVa V4 only effect the reverb, and the amp can be used without a tube in that position at all as long as you keep the reverb turned down. The IVb uses all 12ax7s, so if you have that revision V4 is designed to be used...

The MESA BOOGIE MARK III front panel came in somewhere along the late purple stripe and the red stripe run if I'm not mistaken. Before it would have said MESA/BOOGIE for a brief period and before that MESA/Boogie Ltd. Not that this identifies it, but it should rule out the amp being a no dot/no...

\m/ The Mark IV is one bad beast of an amp for sure. Especially if you can turn it up. Get that Output Level up around 5 and channel master around 3-4 on the lead and hang on! It's worth it even if only on occasion. Side note, Mesa calls that head size Medium, not long. It really doesn't matter...

I really like the old Mullards best in my C+s. I usually run a F91 or F92 long plate in V1 and V5, but a I61 is nice there is s well. I like the I63 in V2-V4. I have a solid stash of old tubes so I roll them around when I get bored. I like Tungsrams in the C+, and for a time at least they were...

You sound big mad for no reason. And you sound wrong about a lot in this thread and the other "I hate C+" thread you have on here. 1. Boogiebabies is not Mike B. Mike B. Is not Boogiebabies. 2. The upgrade does not cost $1,000. It cost less than half that. 3. Boogies aren't based on a Twin. 4...

You've got a good thing going with the Mullards. My favorite combo has been Mullards with Philips 7581a power tubes. More specifically v1-F91, v2-161, v3-I63, v4-I63, v5-F91. Tungsram ecc83 also works really well in the amp and for a time were the stock tube for the C+. Amperex are similar to...

Outside of the differences mentioned above involving the pcb, the differences are in the power transformer. Even a IIC with the RP11a board will most likely have a different pt, at least where the DRG and HRG are concerned. There may have been a couple IICs right at the end that got a 105 and a...

Rev G. Parallel loop unless it has been modded.

Depends on a few things I guess. Availability being the biggest, but you already have one located so that is moot here I suppose. From what I've seen anywhere from $2000 (rare) to around $3000. I could see them going for more if someone really wanted it. I think $2500-3000 is a fair price as...

The difference is noticable, but it is still the same amp no matter what. Some tubes are a little clearer, others a little more grind, but it is all within a sound that is IIC+. I like tubes and I like rolling them but it is an expensive hobby if they aren't your thing. On stage no one is gonna...

I've been digging running Volume 1 a bit lower and lead drive higher lately. Vol 1- 5 pulled, T- 7 pulled, B- 0-2, M- 4-7, Master 5-6 pulled, Lead Drive 10, Lead Master 2-5 pulled. I live in the middle of nowhere ao I can open it up and it is something special when you can get the master up in...