Mod Kits

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

Beginning in 2018, instructions are now online for your convenience, allows us keep our prices competitive, and allows us to help contribute to a greener planet. Links to PDF files will be included in the order status email.

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

... more info

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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5VDC Voltage Regulated Power Supply

5VDC Voltage Regulated Power Supply

Our small, regulated power supply is based on the same regulated 5V supply we use with our 3 Relay Switching Board, and is easy fit into nearly any...
$9.95

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Adjustable Bias Mod Kit

Adjustable Bias Mod Kit

With our Adjustable Bias Kit you can modify your fixed, non-adjustable biased amp so that you can set the bias for optimal performance, and use other...
$17.00

... more info

Bugera 1990 Regulator Mod Kit

Bugera 1990 Regulator Mod Kit

Parts and PDF instructions for correcting the voltage regulator issue in Bugera 1990 amplifiers where overheating of the regulator occurs and causes...
$6.95

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Fan Kit

Fan Kit

Easily add a cooling fan to your amp. Our Fan Kit features an 80mm x 80mm brushless fan for quiet operation, a metal fan guard, and a very small PCB...
$17.00

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Hot Rod Deluxe Mod Kit

Hot Rod Deluxe Mod Kit

The Fender Hot Rod Deluxe is one of the best selling amps of all time, and with our mod kit, can be made to live up to it's full potential with just...
$42.00

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Hot Rod DeVille Mod Kit

Hot Rod DeVille Mod Kit

The Fender Hot Rod DeVille is one of the best selling amps of all time, and with our mod kit, can be made to live up to it's full potential with just...
$52.00

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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

... more info



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