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 against variations of incoming voltage. using an active regu.....

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 + our VCK Voltage Clamp Kit comprise the Power Scaling solution for 99% of all cathode-biased.....

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

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

$78.00

London Power's SV1 Power Scaling Kit, along with our RBX Raw Bias Auxiliary Supply Kit, make up t.....

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

$80.00

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-PCB

S-PRE-PCB

$38.00

S-PRE is our Sprectrum bass preamp and S-PRE-PCB is just the PCB and kit notres. If you would.....

S-PRE-HP

S-PRE-HP

$50.00

S-PRE-HP is the "hard parts" form of S-PRE, inlcuding the PCB and tube sockets and kit notes. .....

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 - LP-Style Reverb Loop: PCB only

REV-PCB - LP-Style Reverb Loop: PCB only

$38.00

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

REV-HP -  LP-Style Reverb Loop: PCB + Hard-to-find Parts only

REV-HP - LP-Style Reverb Loop: PCB + Hard-to-find Parts only

$92.00

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

REV-COMP - LP-Style Reverb Loop: PCB + Components only

REV-COMP - LP-Style Reverb Loop: PCB + Components only

$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 London Power's QRK-MINI amp switching system - the 'MN' in MNR - design.....

QRK-MINI - 4-voice Amp Control Package

QRK-MINI - 4-voice Amp Control Package

$100.00

QRK-MINI is a discount package containing London Power's QRK-LATCH and QRK-MNR switchibng kits. .....

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

The QRK-LDV four-LED driver is optimally suited as a voice indicator in a QRK-style system. The s.....

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 London Power's QRK-LATCH (or similar control circuitry) with four groups of jf.....

QRK-DIP - Four-way DIP switch

QRK-DIP - Four-way DIP switch

$4.00

QRK-DIP is a high-quality four-switch DIP package used on various QRK-series switching cards. .....

QLTCH-BLT - Pre-assembly of QRK-LATCH

QLTCH-BLT - Pre-assembly of QRK-LATCH

$80.00

Add QLTCH-BLT to your order of QRK-LATCH if you would like to receive a pre-assembled board. .....

PX66-PCB - Card for Extra Power Tubes

PX66-PCB - Card for Extra Power Tubes

$38.00

PX66-PCB allows additional pairs of output tubes to be added to a London Power PA66 project, for .....

PX66-HP - Power Expander: includes hard parts

PX66-HP - Power Expander: includes hard parts

$49.00

PX66-HP allows additional pairs of output tubes to be added to a PA66 project, for more power, fu.....

PX66-COMP - Card for Extra Power Tubes with Components

PX66-COMP - Card for Extra Power Tubes with Components

$70.00

PX66-COMP allows additional pairs of output tubes to be added to our PA66 series of power amp kit.....

PSX - Power Scale Control Switch

PSX - Power Scale Control Switch

$15.00

PSX provides an easy interface between ERK Electronic Relay Kit and multiple Power Scale controls.....

PSW - Toggle-style Latching Panel Switch

PSW - Toggle-style Latching Panel Switch

$16.00

PSW is a high-quality latching toggle switch made by C&K, that can be used as a front panel s.....

PSU-TPA - Power Supply for Tube Power Amp: PCB Only

PSU-TPA - Power Supply for Tube Power Amp: PCB Only

$38.00

Tube power amplifiers require various voltages for the plate circuit, bias and heaters. PSU-TPA p.....

PSU-PRE-PCB

PSU-PRE-PCB

$38.00

PSU-PRE is a low-power supply to support tube preamplifiers. PSU-PRE-PCB is just the printed circ.....

PSU-PRE - Power Supply Kit for Tube Preamp

PSU-PRE - Power Supply Kit for Tube Preamp

$98.00

PSU-PRE can support up to five12A_7 tubes - enough for a 3-channel preamp with effects loop, cons.....

PSU-OPA - Opamp Supply Derived from Heater

PSU-OPA - Opamp Supply Derived from Heater

$50.00

PSU-OPA provides a transformer-isolated +/-8Vdc supply for opamps derived from the 6Vac heater su.....

PSU-COMP - Super-Quiet Power Supply for Tube Amp: PCB + Passive Components

PSU-COMP - Super-Quiet Power Supply for Tube Amp: PCB + Passive Components

$158.00

PSU-COMP is the PSU-TPA tube amp power supply PCB plus the components that mount on the board, pl.....

PSU-BLT - Pre-assembly of Large Power Supply

PSU-BLT - Pre-assembly of Large Power Supply

$80.00

Add PSU-BLT to your order, to have the following products shipped pre-assembled: PSU-COMP.....

PSU-50 - Super-Quiet Power Supply for 50W Tube Power Amp

PSU-50 - Super-Quiet Power Supply for 50W Tube Power Amp

$390.00

PSU-50 is a super-low-noise power supply that supports a 50W tube power amplifier, or a 25+25W st.....

PSU-25 - Super-Quiet Power Supply for 25W Tube Power Amp

PSU-25 - Super-Quiet Power Supply for 25W Tube Power Amp

$362.00

PSU-25 supports a 25W tube power amp and preamp and is optimally matched to London Power's PA66-2.....

PSU-100 - Super-Quiet Power Supply for 100W Tube Amp

PSU-100 - Super-Quiet Power Supply for 100W Tube Amp

$520.00

PSU-100 is a super-quiet power supply that can support 100W-worth of tube audio power amplificati.....

PSU-10 - Super-Quiet Power Supply for 10W Tube Power Amp

PSU-10 - Super-Quiet Power Supply for 10W Tube Power Amp

$320.00

PSU-10 supports a 10W tube power amplifier and preamp and is an ideal match to London Power's PA6.....

PSP-BLT - Pre-assembly of Simple PSUs

PSP-BLT - Pre-assembly of Simple PSUs

$40.00

Add PSP-BLT to your order of PSU-PRE Power Supply Kit for Tube Preamp if you would like to receiv.....

PRE2-BLT

PRE2-BLT

$80.00

Add PRE2-BLT to your order of a Tube Preamp that uses two tubes, to obtain that kit pre-assembled.....

PRE1-BLT

PRE1-BLT

$40.00

PRE1-BLT can be added to your order for any Tube Preamp that has a single tube, including: &n.....

PAF - Power Amp Front-end

PAF - Power Amp Front-end

$42.00

PAF is the classic power amp front-end used by London Power in all of its amps, and in hifi amps .....

PA66-S1 - Global Bias Switching for PA66 or PX66

PA66-S1 - Global Bias Switching for PA66 or PX66

$30.00

PA66-S1 provides a panel switch plus the relays that fit onto PA66 or PX66 for easy and/or remote.....

PA66-PCB - Octal Push-Pull Power Amp: PCB only

PA66-PCB - Octal Push-Pull Power Amp: PCB only

$38.00

The London Power PA66-PCB Octal Push-Pull tube power amplifier can be used with any of the common.....

PA66-HP - Octal Push-Pull Power Amp PCB + Hard-to-Find Parts

PA66-HP - Octal Push-Pull Power Amp PCB + Hard-to-Find Parts

$54.00

The London Power PA66-HP Octal Push-Pull tube power amplifier can be used with any of the common .....

PA66-CR - Cathode-Bias Switching Relays

PA66-CR - Cathode-Bias Switching Relays

$20.00

PA66-CR provides the relays that fit onto our PA66 or PX66 power amp projects for easy and/or rem.....

PA66-COMP - Push-Pull Power Amp: PCB + All Passive Components

PA66-COMP - Push-Pull Power Amp: PCB + All Passive Components

$138.00

The London Power PA66-COMP Octal Push-Pull tube power amplifier can be used with any of the commo.....

PA66-50 - 50W Power Amp PCB + Components + OT-50

PA66-50 - 50W Power Amp PCB + Components + OT-50

$348.00

The London Power PA66-50 Octal Push-Pull tube power amplifier can be used with any of the common .....

PA66-25 - 25W Power Amp PCB + Components + OT-25

PA66-25 - 25W Power Amp PCB + Components + OT-25

$264.00

The London Power PA66-25 Octal Push-Pull tube power amplifier can be used with any of the common .....

PA66-10 - 10W Power Amp PCB + Components + OT-10

PA66-10 - 10W Power Amp PCB + Components + OT-10

$245.00

The London Power PA66-10 Octal Push-Pull tube power amplifier can be used with any of the common .....

PA-BLT - Pre-assembly of Power Amp

PA-BLT - Pre-assembly of Power Amp

$80.00

Add PA-BLT to your order of a power amp kit, to receive that kit pre-assembled. This applies to: .....

MOS - Replacement Mosfet + Thermopad

MOS - Replacement Mosfet + Thermopad

$8.00

Did you damage the mosfet in your London Power kit installation? It always saves time to follow t.....

M-PRE-PCB

M-PRE-PCB

$38.00

M-PRE-PCB is the printed circuit board and assembly notes for M-PRE British-style Tube Preamp. .....

M-PRE-HP

M-PRE-HP

$50.00

M-PRE-HP is the "hard-to-find parts" for our M-PRE British-style Tube Preamp, including the print.....

M-PRE - British-Style Preamp Kit

M-PRE - British-Style Preamp Kit

$115.00

M-PRE produces traditional British rock and metal sounds. The card allows wiring as a dual-volume.....

LP-PRE-PCB

LP-PRE-PCB

$38.00

LP-PRE-PCB is the printed circuit board and assembly notes for our LP-PRE London Power 2-Channel .....

LP-PRE-HP

LP-PRE-HP

$50.00

LP-PRE-HP is the printed circuit board, tube sockets and assembly notes for LP-PRE London Power 2.....

LP-PRE - London Power 2-Channel Guitar Preamp Kit

LP-PRE - London Power 2-Channel Guitar Preamp Kit

$128.00

LP-PRE is based on London Power's STANDARD Preamplifier presented in our book The Ultimate Tone (.....

LP-MV - London Power Master Volume

LP-MV - London Power Master Volume

$10.00

We don't normally brag, but this is the best master volume on the planet! Truly transparent. No t.....

LINE - Dual Output Buffer Kit

LINE - Dual Output Buffer Kit

$120.00

The LINE kit is two buffer circuits with transformer-isolated outputs. These buffers can be fed f.....

LIC - Technology Licence (per unit, for commercial builders and installers)

LIC - Technology Licence (per unit, for commercial builders and installers)

$5.00

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

GND - Ground Link Isolator

GND - Ground Link Isolator

$15.00

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

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.....

FSW - Alternate-action Foot Switch

FSW - Alternate-action Foot Switch

$18.00

FSW is a large-body push-on/push-off alternate-action foot switch with a chrome actuator. Popular.....

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 those of the "LPSP" London Power Stan.....

F-PRE-PCB

F-PRE-PCB

$38.00

F-PRE-PCB is the printed circuit board plus assembly notes for F-PRE Fender-style Tube Preamp. .....

F-PRE-HP

F-PRE-HP

$44.00

F-PRE-HP is the "hard-to-find parts" for our F-PRE Fender-style Tube Preamp, including the printe.....

F-PRE - Fender-Style Preamp Kit

F-PRE - Fender-Style Preamp Kit

$88.00

F-PRE is the classic North American style of clean preamp: two gain stages with an EQ and level c.....

EYELETS-1k

EYELETS-1k

$84.00

Order 100 or 1000. Bulk eyelets for your building needs. Two-hundred eyelets is typically en.....

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