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Thanks for the reply. The cable is really long. Only available from Mesa? Been spending considerable time with this amp, liking it more, and now want to keep it. It's my only modern amp. I'm not a rocker or shredder but think "1955-1970" RnR, Rockabilly, Blues, etc. That's pretty much my...

Spent hours reading many threads here to no avail. Two problems. The cable has continuity on every pin. Channels switch ok. The reverb shuts off when cable plugged but won't switch. Reverb light turns on and off. Solo pot works when footswitch connected, as it should, but won't switch and light...

Nice amp. Why the Simul-Class OT and correct power tube wiring but front panel is "full" and "1/2" power? Is that typical? I'm currently having a love/hate thing with my fully loaded MII B combo.

Yeah I'm considering sending it to Mike for the loop mod. If I saw one that was done I could do it myself but that info doesn't seem to be available. I believe it involves cutting traces. We talked and I can do everything else using their parts which are priced very reasonable. Did a couple of...

Update if anyone cares. Talked to Mike B at MB. It's a later Mark II and doesn't use all of V4 for the reverb driver. V4a is part of a cascode circuit on the high gain section. I would've preferred the stronger reverb model. But he gave me a couple of ideas to increase the reverb. Nuff said.

Ok. Found an image right here. It's mb under the power cord. I can get more clean note clarity by plugging an 8 Ohm speaker into the 4 Ohm speaker jack. V2: that would be the effects loop. Hence the 12at7. Mesa schematics can be quite a bit different than actual amp. Must call Mesa. Still...

Just picked up. Fully loaded simul-class EV 12L combo. 86xx serial number. "JC 11-81" top inside edge of chassis. RP-9B pre-amp board. x100 power tranformer Under power cord small case "rl"? "rb"? "ml"? Can't really make it out. I'll search some images. "LJ 2/11/82" under chassis. "HRGS"...