Upgrade your MesaBoogie V-twin (TM) version 1 with clean gain adjustment for increasing or decreasing the volume when your pedal is in clean mode.

This is my contribution to anyone who wants to upgrade their Mesa Vtwin version 1 with clean gain adjustment. You don't have to buy this potentiometer from me to complete this mod although I have made it available for your convenience, this is a fairly easy modification for some one with soldering skills and willing to dissemble their v-twin; it should take about an hour. I don't currently provide full instructions for disassembly and all that because it's fairly self explanatory.

The pictures attached show where to locate the potentiometer, that part is free. This purchase is for the actual potentiometer which is a standard IC component I have purchased in bulk and made available to anyone else who would like to add this feature. I was not able to integrate the toggle switch for modes which is present on the version 2 V-twins.

These are fairly generic guidelines for adding clean gain to an early v-twin floor pedal. It is assumed the person adding clean gain will have mechanical and electronics aptitude. Adding this variable resistor (potentiometer) will exactly duplicate the clean gain adjustment similar to the version 2 V-Twin pedals.

Disassemble v-twin:

Remove thumbscrews over tubes, tubes, knobs from Pots, locknuts from pots, 4-screws from housing. NOTE:  the headphone selector switch must be de-soldered to get the top half of the case off, you may want to mark which wire goes to the front/rear terminal so you get it hooked back up correctly when re-assembling. Remove board from bottom half of housing.

Install Clean Gain Pot

Install pot as shown in image and/or reference schematic. For anyone who doesn't really understand electronics, you are removing a resistor and replacing it with a variable value resistor; take out the resistor and pay attention to exactly where it was connected to the circuit board, then attach one of the outer leads of the pot to the circuit board (where the resister was attached) and then attach the center tap (middle lead on the pots I have) to the other location on the circuit board. The third leg of the pot is not used. After installing, measure physical location on the board and use dimensions for drilling an access hole in the lower housing (sorry, I no longer have the exact drilling coordinates.)