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Randall MTS Series Module SL+ to JCM800 Modification

Randall MTS Module

Convert SL+ to JCM800

One of the great things about the Randall MTS series is the ability to customize your tone to exactly how you want. This includes modifying your modules to get the sound perfect for your setup.

In this article we will cover modifying your Randall SL+ to a JCM800. Check back often as new mods are become available this article will be updated.


Marshall Tone Stack Mod

The current Randall SL+ as well as the original single channel Egnaters have the original Marshall mid circuit with less mid-range than the JCM800 amps. The older Marshall circuits don't have less sizzle or distortion just less mid-range which makes that sizzle or distortion more apparent. You can adjust the mid range circuit with 2 small part changes to make it more like the newer (JCM800) Marshall tone controls. To change to the new Marshall circuit you would have to change R31 to a 33K resistor and C14 to a 470pf (500V min). This would add more cutting mid-range with still about the same level of cut when the mid knob is lower.

Check the original Modification article for PCB board layouts.


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Randall SL+ Module
Randall SL+ Module
Randall Plexi Module
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Randall JTM Module
Randall Brown Module
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