Does “MB” below the power cord mean...

[Raoul Duke]

That a Mk II has had the loop mod?
Looking at a IIB and trying to get one that doesn’t need the mod.
Thanks!!!

 

[woodbutcher65]

No, MB written in sharpie under the power cord means the amp was put through test by Mike Bendinelli. Who tested MOST Mesas in the Mark series.

A smaller number have RS written instead of MB. RS means, yes, Randall Smith.

 

[Raoul Duke]

Thanks!
New to Boogies and trying to buy the right one the first time.
Do subsequent dates below the power cord mean anything on a IIB? Looking at one that has three sets of dates electro-penciled below the cord. IIRC the years are 84, 87, and 90 on a 82 serial number. There are full dates - but these are the years.
How does one tell if the amp has the loop mod?
I’m searching this board as well, but I may be asking too specific questions because I’m not getting a lot of answers, so any help from the Boogie vets is most appreciated!
Thanks and regards,
RD