In my 4W practice amp, I wired a single Ge diode (switchable) across the signal path after the first stage - may be too subtle if you're into super heavy distortion. I leave it on most of the time & control the distortion with guitar volume.
For a heavier sound, try a pair of silicon diodes back-to-back in the same spot, or even more extreme a pair of mosfets. The key is finding the place in the signal chain that has the necessary level for the particular diodes used.
For a heavier sound, try a pair of silicon diodes back-to-back in the same spot, or even more extreme a pair of mosfets. The key is finding the place in the signal chain that has the necessary level for the particular diodes used.
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Unfortunately, I do not have much experience with diodes etc... I pretty much need to find someone to do it for me unless it is very easy as JMFahey says.
Easy is all relative. Driving a car is easy unless you do not know how to do it. All the easy things people have done usually comes about from somebody putting in some effort in.
This one is the deluxe version: adds a full distortion stage, with distortion/gain and volume controls:
ElectroSmash - Marshall MG10 Analysis.
This is the absolute simplest, but sounds quite good: adds extra gain and clipping diodes with just a simple switch:
DEAN MARKLEY K-15 SCH Service Manual free download, schematics, eeprom, repair info for electronics
open that page, it will delay about one minute, and change status to "get manual" , click and download it.
ElectroSmash - Marshall MG10 Analysis.
This is the absolute simplest, but sounds quite good: adds extra gain and clipping diodes with just a simple switch:

DEAN MARKLEY K-15 SCH Service Manual free download, schematics, eeprom, repair info for electronics
open that page, it will delay about one minute, and change status to "get manual" , click and download it.
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