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Randall MTS Series Modules Randall MTS Modules Currently there are 14 different modules available. All modules can be used for the RM4 preamp, RM combos and RM heads. All modules utilize the same panel layout, which includes Gain, Bass, Mid, Treble and Master controls. Also the Egnater modules will work in the Randall amps but with reduced functionality as the Egnater modules have multiple channels per module. A bright switch is included directly under each Bass control. Each preamp module houses two 12AX7 tubes which can be easily changed or replaced. Use the thumbscrewa to remove or secure each module to the front panel of every MTS amplifier. Module Description Ultra Extreme hi-gain, with tight low end and liquid sustain Ultra Lead Hi-gain lead tone with rich harmonic sustain Modern Modern hi-gain distortion. For modern rock to nu-metal Recto Based on the preamp circuit of Mesa Boogies Dual Rectifier JTM Based on the preamp circuit of a classic Marshall JTM45 SL+ Based on the preamp circuit of a hot rodded Marshall Super Lead Plexi Based on the preamp circuit of a classic Marshall Plexi Top Boost Based on the preamp circuit of a Vox AC30TB with a little more kick in the front end Tweed Based on the preamp circuit of a '59 Fender Bassman Blackface Based on the preamp circuit of a Fender Blackface Twin DLX Based on the preamp circuit of a Fender Blackface Deluxe Clean Very warm and round Brown Classic hi-gain brown sound. Basic hot-rodded Plexi XTC Based on the preamp circuit of a Bogner Ecstasy red channel There are also mods for each preamp that are fairly simple if you know how to work a soldering iron. These mainly involve the hi-gain modules and help tighten up the bottom end. These mods are especially useful if you tune down. Other mods help clean up the clean sounds and another takes some gain away from the Top Boost module to get it closer to that Beatles Vox sound. There will be a article specific to these mods. Randall XTC Bogner Ecstasy Module Randall Top Boost Module Randall Clean Module Randall SL+ Module Randall Plexi Module Randall JTM Module Randall Brown Module Randall Tweed Module Randall Blackface Module Randall DLX Module Randall Ultra Module