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Hello, From the chassis photo, the left jack looks to be a RCA jack? That should be the jack to connect the reverb tank. If your Mark II amp has both the graphic EQ and reverb, then this is the appropriate footswitch: https://store.mesaboogie.com/products/footswitch-reverb-eq.html You will...

Check out this thread: http://forum.grailtone.com/viewtopic.php?f=27&t=46590

I think in this case, "PO" stands for "Purchase Order".

I have a Mk. I 1x15 with black Tolex. The serial number Dymo was missing when I bought it. Never really bothered to find out what year it was built, but the address on the silver Mesa sticker was a PO box number. I think the "Big Brother" term refers to all 1x15 models.

The MS-12 Black Shadow (Eminence) was the standard speaker. The EVM-12L was available as an option (extra $70-75, IIRC). The Celestion Black Shadow speaker was not listed on the Mk.II price list. But since Mesa sold them as parts, I am sure they could install in on a MK.II if requested...

Or that Grand Theft Auto game. Sorry to hear about your injuries. The amp looks beautiful. As an owner of an original Mk. I, I am sure it sounds great, too. I hope it will find a good home soon. Good luck.

The following articles might be of interest to you: http://www.premierguitar.com/articles/Everything_You_Ever_Wanted_to_Know_About_Preamp_Tubes http://www.premierguitar.com/articles/Everything_You_Ever_Wanted_to_Know_About_Output_Tubes

There is a video of Randy Smith and Carlos Santana on the amp: http://www.youtube.com/watch?v=8AzmLVtHjLQ If the King Snake sells well, does that mean a "King Mark 2-channel Plus" model would follow? :P

The other jack is Preamp out-Power amp in. Mine came stock with them, though I have seen examples that did not have them.

I suppose original means the amp was shipped from Mesa as a C+. Check out Boogiebabies's guide stickied in this forum: http://www.grailtone.com/forum/viewtopic.php?f=27&t=18184 If the C+ upgrade was done by Mike B., the chassis would be marked as: IIB-->C+ (From a IIB to C+) or IIC-->C+...

IIRC, Dimension C was not released until the mid-80's. The built-in chorus effect on Roland Jazz Chorus amps is probably similar to the CE-1 Chorus Ensemble, or even the Boss CE-2 Chorus pedal.

Ack, just as I suspected. Thanks for clearing that up.

I am in the process of retubing my Mk. I (non-RI) and Mk. IIC+ amps. Apparently, there are 2 types of the Tung-Sol 12AX7 RI tubes: the plain version and the 12AX7/ECC-803S Gold version. Is the gold-pinned one geared more towards audiophiles?

Here are a couple: Roland FC-300 Behringer FCB-1010

Cool. Thanks for the headsup.

Is it the one with Billie Joe of Green Day on the cover?

Back then, I ordered the reverb footswitch (US$25, with cable) to check out that feature. It does produce a deeper reverb compared to the reverb sound without the footswitch. Just dial up the reverb knob real high and you can tell the difference between the two. I suppose to each its own...

Used EVM-12L's are not hard to find. Check out the "Classified" forum here or evilBay. EV has reissued the EVM-12L as EVM-12L Classic, and then there is the 300W "Zakk Wylde Black Label EVM-12L".

High frequencies not being as bright as the EVM-12L.

Hopefully, I have also answered this question in your other thread: http://www.grailtone.com/forum/viewtopic.php?f=27&t=35472&start=15