Schematics

* Custom A/B Signal Relay Switcher
* Cable buffer
* Thordendals (Meshuggah) Stereo Breathcontroller
* 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 NEW
* 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
* Watkins Copy Cat
* Pickup and cable wiring info
* BPM / Delay time conversion matrix

updated: October 31st 2002

Here are some schematics that are hard to find on the web, plus a nice self-designed a/b signal switcher. 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!

recent updates: Thortendals Breathcontroller,Triaxis mods, new Mark I's, new Mark II's and lower kb files of the Quad preamp.

Custom A/B Signal Relay Switcher
Sometimes you need an a/b switch that can be activated with a footswitch, so you don't have to run those miles of cable. This is a design to built your own a/b switch with one input and two outputs (or the other way around), but needs a latching footswitch to change the signal routing and some DC to activate the relay. This is a quality design that should give you noiseless switching. It's being used by me as a mute switch for my preamp and the latching footswitch connection allows me to control it with a Midi Controller. So this is real handy for all you 19" rack freaks. If you use some quality components and good cable then this a/b box shouldn't alter your sound. There is even a mod that prevents groundloophum!.
Schematic and explanation (30k)