Mesa/Boogie Schematics

* Mesa/Boogie Quad Preamp
* Mesa/Boogie Triaxis Preamp
* Mesa/Boogie Studio Preamp
* Mesa/Boogie V-Twin pedal
* Mesa/Boogie 2:90 Poweramp
* Mesa/Boogie 50/50 poweramp
* Mesa/Boogie Strategy 400 poweramp
* Mesa/Boogie Mark I
* Mesa/Boogie Mark II
* Mesa/Boogie Mark III
* Mesa/Boogie Mark IV
* Mesa/Boogie Dual Rectifier Solo Head
* Mesa/Boogie Tremoverb
* Mesa/Boogie Heartbreaker
* Mesa/Boogie Maverick
* Mesa/Boogie Blue Angel
* Mesa/Boogie Subway Blues
* Mesa/Boogie Subway Rocket
* Mesa/Boogie Caliber 50
* Mesa/Boogie Son Of Boogie
* Mesa/Boogie Bass 400
* Mesa/Boogie Speaker Simulations

Here are some schematics that are hard to find on the web. The quality is in most cases as good as the originals that I have. I've gathered these schematics over the years. As far as I know, all the Mesa/Boogie schematics came from people who got the originals from Mesa/Boogie themselves.

With the following schematics you should be able to understand the equipment a lot better, can work out how the signal flow goes, which tube does exactly what/where and it's easier to do some mods. Keep in mind that changes may have occured, these schematics may not give an accurate view of the amp.

All files are either .JPG or .GIF unless stated otherwise. I've done my best to keep their size as low as possible, yet retain detail. I don't post schematics of Marshall, Fender, Bogner, Matchless, 5150, etc. These can "easily" be found at www.schematicheaven.com, http://www.mif.pg.gda.pl/homepages/tom/schematics.htm and many other webpages. I've tried to collect as many Mesa/Boogie schematics as I could and posted all of them. Some can be found at the previous mentioned pages as well.

The designers of these amps have worked years and years to fine-tune it. By no means use it to try to built a replica, it won't work. These schematics are only here for information & repair. Trying to replicate it is useless.

ps I'm still looking for schematics of the Strategy 500 or the Simul 395 Stereo poweramps, please let me know if you have them. Other Mesa/Boogie schematics are welcome as well!

Mesa/Boogie Quad preamp and FU-2 footswitch
Quad main layout #1 (30kb)
Quad main layout #2 (36kb)
Quad layout - additional text (24kb)
Quad lead and graphic EQ circuit (36kb)
Switching system of the Quad (22kb)
Tube layout and functions of the Quad (17kb)
FU-2 footswitch for Quad preamp (40kb)

The tube/signal flow is as follow:
            CH1------V21-----V23-----V12b-----
input---[                                                  ]-----V24-----V14-----fx loop-----V22
            CH2 ------V11-----V13-----V12a-----

V11=input CH2
V12=CH1 + CH2
V13=lead CH2
V14=Graphic EQ + Reverb mixer

V21=input CH1
V22=FX return + output
V23=lead CH1
V24=reverb

For additional info check the Quad Preamp page.