RLY - Mechanical Relay


In Stock
Product Code:


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

Mechanical relays provide complete isolation of the control circuitry and the switched circuitry. This makes them ideal for switching high-voltage features such as rectifiers, triode-pentode mode, etc. The relays selected have a life expectancy of up to 10-million cycles.

RLY has two poles each with normally-open and normally-closed positions.These represent the contact state when the relay coil is not powered. The contacts can be wired for series or shunt switching, as required for the circuit to be controlled.

Use a single RLY for triode-pentode switching of a complete push-pull output stage. Although a single RLY could switch LP-PRE, it is better to use two RLYs to prevent the risk of oscillation. Similarly, two RLYs should be used to switch D-PRE. RLY can also be used for effecst loop bypasing, preamp channel selection, output tube selection, or any other switching requirement.

Use with a latching panel switch, such as PSW, or a latching foot switch, such as FSW.

Use with DFC, QRK-RLY or QRK-SF for sophisticated system control.

Power requirement: 12Vdc at 12mA

PCB size: 1" square, 25mm square

See also:

FSW - Push-on/push-off latching foot switch

PSW - toggle-style panel switch


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


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
PO Box 10012, Thunder Bay, ON P7B 6T6 CANADA