All Kits & Mods

A master list of all kits, mods and building supplies from London Power

Z-PRE-PCB

Z-PRE-PCB

$38.00

Z-PRE-PCB is the PCB and notes for the Zen-style High-gain Tube Guitar Preamp. See Z-PRE for .....

Z-PRE-HP

Z-PRE-HP

$50.00

Z-PRE-HP is the PCB plus tubes plus kit notes for the Zen-style High-gain Tube Preamp. See Z-.....

Z-PRE - High Gain Preamp Kit

Z-PRE - High Gain Preamp Kit

$115.00

Modern high-gain guitar sounds are easily produced with a pair of 12AX7 tubes in a cascaded four-.....

VCK-HV - High-Voltage Clamp Kit

VCK-HV - High-Voltage Clamp Kit

$65.00

VCK-HV stabilises the supply voltage tagainst variations of incoming voltage. using an active reg.....

VCK-BLT - Pre-assembly of VCK

VCK-BLT - Pre-assembly of VCK

$40.00

Add VCK-BLT to your VCK order if you would like to receive this kit pre-assembled. The assemb.....

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 .....

V-PRE-PCB

V-PRE-PCB

$38.00

V-PRE-PCB is the printed circuit board and assembly notes for V-PRE Vox Top-Boost-style Tube Prea.....

V-PRE-HP

V-PRE-HP

$44.00

V-PRE-HP includes the "hard parts" for V-PRE Vox-Top-Boost-style Tube Preamp, including the print.....

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.....

TX976 - 50-100W Output Transformer

TX976 - 50-100W Output Transformer

$120.00

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

TX365 - 3H Choke

TX365 - 3H Choke

$20.00

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

TX364 - 150H Choke

TX364 - 150H Choke

$20.00

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

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.....

TREM - Tremolo level tracker

TREM - Tremolo level tracker

$15.00

TREM provides automatic tremolo modulation depth control with Power Scale control adjustment for .....

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 .....

T5S - TUT5 Standard Project - Semiconductors only

T5S - TUT5 Standard Project - Semiconductors only

$36.00

For the hobbyist who can source most parts but wants the semiconductors from one source. This kit.....

SV84 - Super-Versatile Super-Value Power Scaling Kit for Single-Node

SV84 - Super-Versatile Super-Value Power Scaling Kit for Single-Node

$48.00

Most guitar amplifiers have separate power supply nodes for the the screen and plate of the outpu.....

SV3 - Super-Versatile Tracking High-Voltage Regulator

SV3 - Super-Versatile Tracking High-Voltage Regulator

$54.00

The SV3 Is a Tracking High-voltage Regulator used as part of a Power Scaling solution in tube amp.....

SV2 - Super-Versatile Super-Value Power Scaling Kit for Cathode Bias

SV2 - Super-Versatile Super-Value Power Scaling Kit for Cathode Bias

$64.00

SV2 + VCK is the Power Scaling solution for 99% of all cathode-biased amps: Your amp is: <.....

SV1 - Super-Versatile Super-Value Power Scaling Kit for Fixed Bias

SV1 - Super-Versatile Super-Value Power Scaling Kit for Fixed Bias

$78.00

SV1 + RBX is the Power Scaling solution for 99% of guitar and bass amps. These are the kits you n.....

SV-TT - Super-Versatile 2/3rds Power Scaling Kit for Tube Amp

SV-TT - Super-Versatile 2/3rds Power Scaling Kit for Tube Amp

$74.00

SV-TT is a truly universal Power Scaling solution for 100% of guitar and bass amps. SV-TT is .....

SV-BLT - Pre-assembly of Power Scaling Kit

SV-BLT - Pre-assembly of Power Scaling Kit

$60.00

Add SV-BLT if you would like to receive your Power Scaling kit pre-assembled. This applies to: .....

SUS-3 - Sustain & Compression Enhancer for Fixed Bias with Power Scaling

SUS-3 - Sustain & Compression Enhancer for Fixed Bias with Power Scaling

$12.00

The SUS-3 is specifically designed for fixed-biased amplifiers fitted with Power Scaling. The.....

SUS-2 - Sustain & Compression Enhancer for Cathode Bias

SUS-2 - Sustain & Compression Enhancer for Cathode Bias

$12.00

The SUS-2 is suitable for cathode-biased amps. It can be used in single-ended or push-pull amplif.....

SUS-1 - Sustain & Compression Enhancer for Fixed Bias

SUS-1 - Sustain & Compression Enhancer for Fixed Bias

$38.00

SUS-1 is suitable for non-Power Scaled, fixed-bias amps. The signal envelope has three parts:.....

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 .....

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.....

S-PRE - London Power Spectum Bass Preamp Kit

S-PRE - London Power Spectum Bass Preamp Kit

$115.00

The S-PRE is based on the preamp sections of London Power's SPECTRUM bass amps. The front end is .....

RLY - Mechanical Relay

RLY - Mechanical Relay

$12.00

RLY is comprised of a miniature 12Vdc relay on a PCB to make wiring easy. Mechanical relays p.....

REV-PCB

REV-PCB

$38.00

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

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-COMP

REV-COMP

$120.00

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

REV - LP Style Reverb Loop Kit

REV - LP Style Reverb Loop Kit

$180.00

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

RBX-BLT - Pre-assembly of RBX

RBX-BLT - Pre-assembly of RBX

$20.00

If you would like to receive RBX Raw Bias Auxiliary Supply pre-assembled, add RBX-BLT to your RBX.....

RBX - Raw Bias Auxiliary Supply Kit

RBX - Raw Bias Auxiliary Supply Kit

$49.00

The RBX provides a high-voltage low-impedance raw bias supply when one is not readily available i.....

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 - typically 60dB from 50Hz to .....

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 - typically 60dB from 50Hz to .....

QRK-VX - Voice Selection Expander

QRK-VX - Voice Selection Expander

$14.00

 QRK-VX is required when more than four system "voices" must be controlled in a guitar rig, .....

QRK-SW - Four-way Panel Switch Assembly

QRK-SW - Four-way Panel Switch Assembly

$20.00

QRK-SW is a set of four momentary-action push switches mounted on a PCB. This mounts to the front.....

QRK-SR - Single Relay Controller Interface for QRK

QRK-SR - Single Relay Controller Interface for QRK

$11.00

QRK-SR allows up to four voice control lines to interface with a a group of relays switched in ta.....

QRK-SF - Single Jfet Controller Interface for Multi-Voice Control

QRK-SF - Single Jfet Controller Interface for Multi-Voice Control

$19.00

 QRK-SF allows multiple voice control inputs to interface with a set of jfet control lines, .....

QRK-RLY - 4-way Relay Controller

QRK-RLY - 4-way Relay Controller

$45.00

 QRK-RLY provides interfacing for four relay groups. QRK-RLY is the equivalent of four QRK-S.....

QRK-MNR - FX loop controller + more

QRK-MNR - FX loop controller + more

$42.00

QRK-MNR is the "heart" of the QRK-MINI amp switching system - the 'MN' in MNR - designed to provi.....

QRK-MINI - 4-voice amp control package

QRK-MINI - 4-voice amp control package

$100.00

QRK-MINI is a discount package containing QRK-LATCH and QRK-MNR. The most popular multi-voice.....

QRK-LED - Four LEDs for Amp Panel

QRK-LED - Four LEDs for Amp Panel

$12.00

QRK-LED is an assembly of four LEDs on a PCB. This can be supported atop QRK-SW for a clean, mode.....

QRK-LDV - Four-LED Driver

QRK-LDV - Four-LED Driver

$18.00

QRK-LDV drives four LEDs and is optimally suited as a voice indicator in a QRK-style system. The .....

QRK-LATCH - Quad Voice Controller for Guitar Amps

QRK-LATCH - Quad Voice Controller for Guitar Amps

$73.00

 QRK-LATCH is the heart of the QRK Quad Relay Kit amp switching system. provides a 1.....

QRK-JFT - N-jfet with Gate Diode

QRK-JFT - N-jfet with Gate Diode

$4.40

QRK-JFT combines an n-jfet and its gate diode on a small PCB to make series-switch wiring easy. L.....

QRK-FSW - Push-button for Foot Switch

QRK-FSW - Push-button for Foot Switch

$9.00

QRK-FSW is a high quality Switchcraft momentary-action push-button suitable for use as a foot swi.....

QRK-FET -  Quad Jfet Interface for Series and Shunt Switching

QRK-FET - Quad Jfet Interface for Series and Shunt Switching

$70.00

QRK-FET interfaces QRK-LATCH (or similar control circuitry) with four groups of  jfet switch.....

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