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
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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MOSFET B+ Drop Mod Kit

MOSFET B+ Drop Mod Kit

Want to "brown" your amp's tone? The MOSFET B+ Drop kit provides a more cost effective method of reducing B+ (high voltage) than the...
$20.00

... more info

OptoFET Channel Switch Jack

OptoFET Channel Switch Jack

Now shipping version 2! The Granger OptoFET Channel Switch Jack allows noiseless signal routing without clicks or pops that are usually associated...
$35.00

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OptoFET Daughter Board

OptoFET Daughter Board

By request! The Granger OptoFET Daughter Board works with our popular OptoFET Channel Switch Jack, when more than one DPDT switch function is needed....
$22.00

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SuperFET Jack

SuperFET Jack

The Granger SuperFET Jack is a high gain, MOSFET driven preamp gain stage that operates at high tube voltages. The entire circuit is mounted on a...
$40.00

... more info

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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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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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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Low Voltage Power Supply - Regulated, Adjustable

Low Voltage Power Supply - Regulated, Adjustable

This fully assembled, regulated, low voltage power supply makes it possible to run any 4.5VDC-13.5V circuit inside your tube amp powered from your...
$25.00

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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



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