All Books, Kits & Mods

Master list of all London Power / Power Press Publishing books, kits, mods and downloads.

T5 - Switching Update

T5 - Switching Update

$0.00

FREE! Use link below for immediate access. Do not add to cart. Thanks! The Standard project f.....

HF-QS - Hifi Quiet Supply

HF-QS - Hifi Quiet Supply

$2.00

HF-QS is used to provide extraordinarily smooth DC voltages to solid-state power amplifier front-.....

JLH-10 - Class-A PA

JLH-10 - Class-A PA

$2.00

JLH-10 is the classic 1969 John Linsley-Hood circuit of a solid-state 10W class-A power amp desig.....

X212 - Electronic Crossover 2-way 12db

X212 - Electronic Crossover 2-way 12db

$2.00

X212 is an electronic crossover providing high-pass and low-pass outputs with 12db/octave slopes......

X224 - Electronic Crossover 2-way 24db

X224 - Electronic Crossover 2-way 24db

$2.00

X224 is an electronic crossover providing high-pass and low-pass outputs with 24db/octave slopes......

AL20 - Class-A Baby Leach Amp

AL20 - Class-A Baby Leach Amp

$4.00

AL20 is a pure class-A "Baby" Leach solid-state power amp. 20W pure class-A complim.....

BL20 - "Baby" Leach Power Amp

BL20 - "Baby" Leach Power Amp

$4.00

BL20 is the "Baby" Leach amp. Where most similar designs are aimed at 100W+, BL20 is targeted for.....

BLQE - "Baby" Leach w/ Quad-Comp EF Output

BLQE - "Baby" Leach w/ Quad-Comp EF Output

$4.00

BLQE is the "Baby" Leach power amp with a Bryston-style Quad-Complementary output stage wired for.....

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. .....

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.....

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.....

CARD - Circuit Card Refill

CARD - Circuit Card Refill

$7.00

6" x 12" x 1/16" thick glass-epoxy card stock. Rigid material - can be cut to size by the user. .....

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.....

EYELETS-100

EYELETS-100

$9.00

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

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.....

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.....

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.....

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-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.....

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.....

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-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.....

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, .....

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.....

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.....

MOLS - My Own Loudspeaker System

MOLS - My Own Loudspeaker System

$15.00

My Own Loudspeaker System By Giovanni Bianchi, ©2015, ISBN 978-0-9781311-2-8   .....

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.....

TREM - Tremolo level tracker

TREM - Tremolo level tracker

$15.00

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

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.....

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.....

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-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, .....

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 .....

SPKR - London Power Speaker Book

SPKR - London Power Speaker Book

$19.00

London Power DIY Speaker Cabinets for Musical Instrument Applications By Kevin O'Connor, ©200.....

SSH - Secrets & Secret Holders

SSH - Secrets & Secret Holders

$19.00

Secrets and Secret Holders - A Report on Intellectual Property in the Musical Instrument Amplifie.....

PA66-CR

PA66-CR

$20.00

PA66-CR provides the relays that fit onto PA66 or PX66 for easy and/or remote switching between c.....

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.....

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.....

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.....

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.....

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.....

RSG - Ready Set Go!

RSG - Ready Set Go!

$24.00

Ready Set Go! - An Electronic Reference for the Everyman By Kevin O'Connor, ©1999, ISBN 0-969.....

PX66-PCB -  card for extra power tubes

PX66-PCB - card for extra power tubes

$28.00

PX66-PCB allows additional pairs of output tubes to be added to PA66, for more power, fuller tone.....

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 .....

ERK - Electronic Relay Kit

ERK - Electronic Relay Kit

$29.00

ERK Features: A, B exclusive selection ground-referenced jfet shunt switch elements.....

TOT - Tonnes of Tone

TOT - Tonnes of Tone

$29.00

Tonnes of Tone - Electronic Projects for Guitar and Bass By Kevin O'Connor, ©1996, ISBN 0-969.....

PA66-S1

PA66-S1

$30.00

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

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.....

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.....

BFX-PCB

BFX-PCB

$38.00

BFX is the Best All-Tube Effects Loop, and BFX-PCB is the printed circuit board and kit notes for.....

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.

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