Mod Kits

Mod kits contain parts to modify or add to your amplifier.

Please note: Some mod kits, such as those with PC boards, take time to assemble before shipment. Please allow 4-6 business days prior to shipping. If you have time requirements, please contact us to inquire about availability and shipment times.



Product Image Item Name- Price
$1.00 Generic/Add-on

$1.00 Generic/Add-on

This item listing allows add-on and upgrade amounts to be added to your Granger Amplification Custom Shop invoice. You may also use this to make...
$1.00

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Ultimate FX Loop

Ultimate FX Loop

Granger Amplification is now offering our new high voltage, zero-loss, true-bypass effects loop in kit form. Our Ultimate Effects Loop works...
$70.00

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Variable Power Control - VPC1 Kit

Variable Power Control - VPC1 Kit

Our Variable Power Control is a quick and easy way to install variable output power reduction in your amp. Our VPC Kit easily installs in cathode...
$40.00

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VariWattage Kit

VariWattage Kit

Now available in kit form! For fixed bias amps from 20-150 watts. VariWattage is our solution to varying the output wattage in many vacuum tube...
$63.50

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Jose Master Volume Kit

Jose Master Volume Kit

Our new Jose Master Volume Kit was created by request, and is based on the master volume created by amp tech Jose Arredondo in the 70s. Now you can...
$22.00

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PPIV Master Volume Kit

PPIV Master Volume Kit

If you've got an old Marshall, or other push-pull, non-master volume amp, you already know it has to be cranked up fairly high to get overdriven...
$16.00

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1 Relay Switching Board

1 Relay Switching Board

By request! The 1 Relay Switching Board is a versatile add-on board, based on our popular 3 Relay Switch Board, that has a single DPDT 5V relay (2...
$25.00

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3 Relay Switching Board (Ver 2)

3 Relay Switching Board (Ver 2)

Now shipping Version 2, featuring a voltage regulated power supply. The 3 Relay Switching Board is a versatile add-on board that has three DPDT 5V...
$45.00

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Mesa 50/50 Power Amp Mod Kit

Mesa 50/50 Power Amp Mod Kit

AVAILABLE NOW! Greatly improve the tone and performance of the Mesa Boogie 50/50 Stereo Power Amplifier by installing our mod kit. Noted...
$40.00

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X-Gain Mod Kit

X-Gain Mod Kit

The X-Gain Mod Kit is the same X-Gain Mod we offer with our M50 Plexi and M100 SuperPlexi amps. It is a switchable (via Push-Pull pot) mod that...
$35.00

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