The Boogie Board

Discussion Forum for Mesa Boogie Products
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PostPosted: Wed Jan 10, 2018 4:09 pm 
Mark II

Joined: Wed Dec 23, 2015 9:50 am
Posts: 98
I am looking for a schematic rendering or pictures of a R2 mod

I see old posts but the pics are no longer available

Mark iia
1985 Mark iii Simul Class Black Dot w/Red Stripe upgrade
1987 Mark iii Coliseum Purple Stripe
Mark IVb
Mark V

PostPosted: Wed Jan 10, 2018 4:57 pm 
Mark III

Joined: Sun Aug 21, 2016 5:23 pm
Posts: 189
Location: Hardwood Heaven
If the old images are on Photobucket you can sometimes copy the URL and go directly to their site to look at the images.

MESA/Boogie Timeline:

PostPosted: Wed Feb 21, 2018 6:05 am 
Bottle Rocket

Joined: Wed Jan 31, 2018 8:32 am
Posts: 18
I don't have a schematic or drawing of it but I'm finishing off a complete verified Mark III schematic and will be doing the R2 mod shortly. I'll update the schematic and let you know. But from the info on various places on this board I've written down it's fairly simple:

Replace R130 with a 250K audio taper pot. Part should be is 591048.

You should be able to do the mod without lifting out the board. On the short heads or combos you can put the pot where the direct level control is. The direct level can be preset with a resistor so it will still work but isn't adjustable.

OR you can get rid of the direct out completely. Plug the hole where the pot was, and put the R2 master pot where the direct out jack was

PostPosted: Fri Feb 23, 2018 2:03 pm 
Dual Recto

Joined: Tue Feb 07, 2006 11:21 pm
Posts: 2832
Location: North Alabama C+ Mafia-Kingpin

This is how you do it.

"One of these days, I'm gonna change my evil ways....... one of these days.

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