Amp Mods

Amp Mods

Our selection of Amp Mod kits is a tinkerer's delight! Covers master volumes, bias mods, Quiet Supplies, GmX to make your amp sound huge, 2-channel mod for vintage Fenders, and much more.

Designed by Kevin O'Connor and supplied with the highest quality parts.

If you have questions about application or installation, please email us at amps@londonpower.com, or phone 807-473-0952 from 11am-6pm, M-F. 

BFX - Best All-Tube Effects Loop Kit

BFX - Best All-Tube Effects Loop Kit

$98.00

BFX can be incorporated into any tube amp, providing a tube solution to active effects loop requi.....

BMK2 - Bias Mod Kit

BMK2 - Bias Mod Kit

$24.00

Bias Mod Kits allow easy checking of output tube bias currents, regardless of whether those tubes.....

BMK4 - Bias Mod Kit

BMK4 - Bias Mod Kit

$35.00

Bias Mod Kits allow easy checking of output tube bias currents, regardless of whether those tubes.....

BMK6 - Bias Mod Kit

BMK6 - Bias Mod Kit

$44.00

Bias Mod Kits allow easy checking of output tube bias currents, regardless of whether those tubes.....

BMK8 - Bias Mod Kit

BMK8 - Bias Mod Kit

$53.00

Bias Mod Kits allow easy checking of output tube bias currents, regardless of whether those tubes.....

FPM - 2-Channel Fender Preamp Mod

FPM - 2-Channel Fender Preamp Mod

$15.00

FPM converts the preamp channels in a vintage Fender amp to that of the LPSP London Power Standar.....

GMX-KIT - Transconductance Multiplier

GMX-KIT - Transconductance Multiplier

$89.00

The "GmX" effect is the difference of sound between a 50W amp with two power tubes and a 100W amp.....

GND - Ground link isolator

GND - Ground link isolator

$15.00

GND replaces the old-fashioned ground 'lift' switch of olde with a modern automatic ground-link g.....

LIC - Technology Licence (per unit)

LIC - Technology Licence (per unit)

$5.00

NOTE: Installations and constructions using London Power kits are inherently licenced, and no add.....

LP-MV London Power Master Volume

LP-MV London Power Master Volume

$10.00

This is the best master-volume on the planet! Truly transparent. No tone change with setting. And.....

QS-HV - Quiet Supply for High-Voltage Tube Amps

QS-HV - Quiet Supply for High-Voltage Tube Amps

$52.00

The QS-HV provides a large reduction of supply-borne noise and hum. Supply noise is especially pr.....

QS-LV - Quiet Supply for Low-Voltage Tube Amps

QS-LV - Quiet Supply for Low-Voltage Tube Amps

$49.00

The QS-LV provides a large reduction of supply-borne noise and hum. Supply noise is especially pr.....

REV-HP -  Reverb PCB + Hard-parts

REV-HP - Reverb PCB + Hard-parts

$92.00

This is the London Power style reverb loop, using a push-pull reverb driver and two-stage recover.....

REV-PCB

REV-PCB

$38.00

This is the London Power style reverb loop, using a push-pull reverb driver and two-stage recover.....

SEM - Single-Ended Mod

SEM - Single-Ended Mod

$10.00

The SEM allows the tone of a single-ended amp to be produced by any push-pull fixed-bias or catho.....

SL-MV - Splitter Limit Master Volume

SL-MV - Splitter Limit Master Volume

$19.00

Techs and amp designers have used various methods to control the gain of the Schmitt splitter as .....

TBS - Tracking Bias Supply Kit for Fixed-Bias

TBS - Tracking Bias Supply Kit for Fixed-Bias

$28.00

The TBS provides an easy installation of a tracking bias supply for fixed-biased amplifiers. The .....

TX316 - Push-Pull Reverb Driver Transformer

TX316 - Push-Pull Reverb Driver Transformer

$48.00

Hobbyists and amp builders can now use the same high-quality transformers and chokes found in Lon.....

V-PRE - Vox Top Boost Preamp

V-PRE - Vox Top Boost Preamp

$88.00

V-PRE is the famous Vox "Top Boost" channel of their classic AC-30 amp from the 1960s 3-w.....

VCK - Voltage Clamp Kit

VCK - Voltage Clamp Kit

$50.00

VCK Voltage Clamp Kit stabilises voltages in a tube preamp, helping to keep tone consistent with .....

About London Power

London Power was founded in 1990 by Kevin O'Connor, after two decades of research into innovative audio amplification techniques. Kevin is an audio designer, author and speaker, known for his proprietary methodology called Power Scaling, and for his eleven books on audio subjects. Whether you seek amps, kits or information, you'll find useful answers here on not just the "how" but the "why" of audio amplifier design. Please enjoy the information on this site, and don't hesitate to contact us with questions.

Contact Us

(807) 473-0952
11 am - 6 pm, M-F
amps@londonpower.com
PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA