Channel Switchers

Channel switchers for all occasions! Switch between two or more voices seamlessly with our various switching kits, using technology that can be maintained forever.

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

Download our informative PDF: London Power ERK, RLY & QRK-series Switching Kits Selection & Application (2.2 MB, 22 pages).

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 EST

DFC - Dual Function Controller

DFC - Dual Function Controller

$68.00

DFC - Dual Function Controller allows independent control over two functions or features in an am.....

DFC-BLT - Pre-assembly of DFC

DFC-BLT - Pre-assembly of DFC

$80.00

If you would like to receive your DFC Dual Function Controller kit pre-assembled, add DFC-BLT to .....

ERK - Electronic Relay Kit

ERK - Electronic Relay Kit

$29.00

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

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.....

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.....

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, .....

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.....

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