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Marshall JCM800 Footswitchable Solo Boost

When I had a band, I have a problem, because I didn’t have the second channel on my JCM 800, to boost my solos. We were playing 80’s metal, so gain on my Marshall was on 10, and I couldn’t get through the mix with pedals. Then I find a great solution…

WARNING! – Please Read this Information Carefully:
The project described utilizes POTENTIALLY FATAL HIGH VOLTAGES. If you are in any way unfamiliar with high voltage circuits or are uncomfortable working around high voltages, PLEASE DO NOT RISK YOUR LIFE BY BUILDING THEM. Seek help from a competent technician before building any unfamiliar electronics circuit. While efforts are made to ensure accuracy of these circuits, no guarantee is provided, of any kind!

USE AT YOUR OWN RISK: THE WEBMASTER, PROJECT COORDINATOR, PROJECT CONTRIBUTORS AND WEB SPACE PROVIDER EXPRESSLY DISCLAIM ALL LIABILITY FOR INJURY OR PROPERTY DAMAGE RESULTING FROM THIS INFORMATION! ALL INFORMATION IS PROVIDED ‘AS-IS’ AND WITHOUT WARRANTY OF ANY KIND.

Marshall JCM800 Footswitchable Solo Boost

Because this was the original 1983 Marshall JCM800 2203 amp, I didn’t want to change to much, and I wanted, that all changes are reversable easy.

The logic is simple, I add another master volume knob, and relay to switch between two masters .

Installing Master Volume

I replace LOW input with 250K alpha pot and glued it on the side.

I add relay to switch between two master volumes

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And I use one of the speaker outputs to control relay with footswitch.


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