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Based on the knob labeled Post FX indicates that it’s a iib+, with the + indicating that it’s had the factory mod. The bottom inputs are for reverb/EQ or boost/EQ, not sure how to tell how it’s wired. Mine is boost/eq, as I keep the reverb on all the time. Great feature!

Is the hum present with the EQ set flat? Specific frequency sliders? It interacts with the passive tone stack, have you recently changed those?

I’d appreciate opinions as to which of these two cabs would be preferable for my current equipment and style. Both are the same $. My iib+ combo is sixty watt with EV speaker, reverb, and GEQ. I use a lot of different tones, from jazz clean to metal scream, both with and without pedals. My...

I have a Bass 400+ that I run with the Bag End cabinets (I'm primarily a bass player), and running an OD/Distortion in front of it is still a little stiff. Nature of the beast with the 400+, it's perfect for my needs - clean clean clean. Your explanation makes perfect sense as to why I was...

I researched the forum, but couldn't find an answer. I'd like to use my IIB to drive an 8ohm Bag End bass cabinet with my P-bass. I already gave it a try, with somewhat less than satisfying results. I'm not trying to gig with it, I'm just wanting to get a crunchy bass sound. I know that the...

As posted by Boogiebabies, ""A “+” also refers to any amplifier upgraded below 12,500 that has been verified either by the loop test or visual circuit identification. If your amp was upgraded in the early 90’s to the present, Mesa will have an RA, or Return Authorization verifying the...

Hi all, New to the board, cool resource! I just picked up a great 'little' amp, a 1981 Mark IIB. It's 60 watt (2 6L6s) with graphic eq, reverb, original EVM 12L speaker, and the Mike B. effect loop mod (Dyno Label = PSTFXLVL). Included a padded Mesa cover and original paperwork. Also, as a...