The Valve Wizard

Parts for valve amplifiers!

Universal Effects Loop PCB

This PCB allows you to make a valve serial effects loop (as described in my book, section 12.9). It offers low output impedance for driving cables and is inherently output voltage protected. It can of course be retro-fitted to an existing amp, and with suitable adjustment of R1/R2 and R9/R10 can be made transparent when not in use. C1 may or may not be required depending on your setup.

The circuit is shown below with suggested component values.

See the shop page for pricing.