Effects Loops

Our BFX - Best All-Tube Effects Loop kit is, well, the best! Read more about it and see if you'd like to add it to your tube amp project.

BFX can be added to any tube amp.

All kits designed by Kevin O'Connor and supplied with the highest quality parts.

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.

BFX - Best All-Tube Effects Loop Kit

BFX - Best All-Tube Effects Loop Kit


BFX can be incorporated into any tube amp, providing a tube solution to active effects loop requi.....

BFX-BLT - Pre-assembly of BFX

BFX-BLT - Pre-assembly of BFX


Add BFX-BLT to your order for BFX - Best All-Tube Effects Loop Kit to have the BFX pre-assembled......

QRK-MNR - FX Loop Controller + more

QRK-MNR - FX Loop Controller + more


QRK-MNR is the "heart" of London Power's QRK-MINI amp switching system - the 'MN' in MNR - design.....

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