The Valve Wizard

Parts for valve amplifiers!

EF86 Input Stage PCB

This PCB allows you to build an EF86 pentode stage with gain control and ValveWizard signature morph control (discussed in my book, section 2.13)! This allows you to morph the characteristics between pentode and triode mode. Of course, you don't have to use the pots if you don't want to, you can just jumper across the pads to create an ordinary pentode stage, or triode-strapped stage, or whatever you like. If you don't want to use a jack socket because you're using the PCB as an intermediate stage in a larger amp design you can inject the input signal to the solder pad labelled 'IN', which lines up with the 'OUT' pads on my other PCBs.

The circuit is shown below.

See the shop page for pricing.