All Books, Kits & Mods

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

M-PRE-HP

M-PRE-HP

$50.00

M-PRE-HP is the "hard parts" for M-PRE British-style Tube Preamp, including the printed circuit b.....

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. .....

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.....

PA66-10 - PCB + Components + OT-10

PA66-10 - 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 .....

PA66-25 - PCB + Components + OT-25

PA66-25 - 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 .....

PA66-50 - PCB + Components + OT-50

PA66-50 - 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 .....

PA66-976 - PCB + Components + LP TX976 Transformer

PA66-976 - PCB + Components + LP TX976 Transformer

$306.00

The London Power PA66-976 Octal Push-Pull tube power amplifier can be used with any of the common.....

PA66-COMP - PCB + All Passive Components

PA66-COMP - 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-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-PCB - Octal Push-Pull Power Amp - Board Only

PA66-PCB - Octal Push-Pull Power Amp - Board Only

$38.00

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

POP - Principles of Power

POP - Principles of Power

$44.00

Principles of Power - A Practical Guide to Tube Power Amplifier Design By Kevin O'Connor, ©19.....

PSU-BLT - Assembly of Large Power Supply

PSU-BLT - Assembly of Large Power Supply

$80.00

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

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

PSU-10 - 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.....

PSU-25 - Power Supply for Tube Power Amp + 25W Transformer

PSU-25 - Power Supply for Tube Power Amp + 25W Transformer

$362.00

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

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: .....

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

PSU-50 - 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-COMP - Power Supply for Tube Amp - PCB + Passive Components

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

$138.00

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

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-PRE - Power Supply Kit for Tube Preamp

PSU-PRE - Power Supply Kit for Tube Preamp

$98.00

PSU-PRE can support up to six 12A_7 tubes - enough for a 3-channel preamp with effects loop, cons.....

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.....

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.....

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 PA66 for more power, fuller tone.....

PX66-HP - Power expander includes hard parts

PX66-HP - Power expander includes hard parts

$38.00

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

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.....

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.....

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.....

PA66-S2

PA66-S2

$40.00

PA66-S2 provides a panel switch plus the relays that fit onto PA66 or PX66 for easy and/or remote.....

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 .....

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-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.....

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-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-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.....

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 wouldlike to receive a pre-assembled board. I.....

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-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-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-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-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-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-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-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-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, .....

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 .....

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 .....

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.....

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.....

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.....

REV-COMP

REV-COMP

$120.00

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

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