Randall MTS Treadplate module

This is basically a later version of the Recto module with a few component changes. Here's a summary of value differences.

Component	Recto	Rectified	Treadplate	Grail
C3	0.0047uF	0.0022uF	0.0022uF	0.0005uF
C14	470pF	470pF	300pF	470pF
R1-3	470Ohm	470Ohm	150Ohm	150Ohm

Mods

replaced C3 with a Wima 0.001uF cap.

Randall MTS Recto Module

These were Randall's first attempt at a Mesa Boogie Rectifier module. There have been a number of variants since the original Recto module, each called something different:

Randall MTS Ultra Module

Issues

Randall MTS Top Boost module

This module is Randall's take on a boosted Vox AC30TB.

Randall RM20 master volume mod

Warning! There are lethal voltages inside your RM20. If you don't know what you are doing, then get a qualified amp tech to make these mods.

Randall MTS Modern module

Apparently the Modern is higher gain version of the Top Boost module.

Randall MTS Brahma module

Randall described the module as follows: