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Randall MTS Series Clean Module Modifications

Randall MTS Module

Randall MTS Module Mods

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 the current modifications to the different clean modules. Check back often as new mods are become available this article will be updated.

Randall Clean Mods

There was an issue discovered after several production runs in all the clean to mid-gain Randall models including the Clean, Blackface, DLX, Top Boost, Plexi, JTM, & Brown, that causes excess distortion overloading the input gain. Too eliminate this issue and clean up these modules, position R1 which is a 470 ohm 1/2w resistor, needs to be changed to a 150 Ohm 1/2w resistor. This is only the early production Randall models and some of the early Egnater models. The new modules have been fixed at the factory but you should check any current module that you have. You can identify what value is in your module by the color bands located on the resistor, 470 ohm resistors have yellow, purple, and brown color bands, where the correct 150 ohm resistors have brown, green, brown color bands.

Randall Clean Mod

Sound clip features a before and after on the JTM module with the resistor change. Overall impression is that the module is less "buzzy" sounding.

Sound Clip JTM Clip

The settings for the sound clips are available at Randall MTS Settings page.


Randall XTC Bogner Ecstasy Based Tube Preamp Module
Randall XTC Bogner Ecstasy Module
Randall Top Boost Module
Randall Top Boost Module
Randall Clean Module
Randall Clean Module
Randall SL+ Module
Randall SL+ Module
Randall Plexi Module
Randall Plexi Module
Randall JTM Module
Randall JTM Module
Randall Brown Module
Randall Brown Module
Randall Tweed Module
Randall Tweed Module
Randall Blackface Module
Randall Blackface Module
Randall DLX Module
Randall DLX Module
Randall Ultra Module
Randall Ultra Module

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