Cusack Project 34 Selenium Rectifier Pre/Drive

That’s a long-winded way of saying that, just like silicon or germanium diodes—aka “rectifiers”—the lesser-seen selenium can also be used for gain stages in a preamp or drive pedal. Enter the new Project 34 Selenium Rectifier Pre/Drive from Michigan-based boutique maker Cusack, named after the element’s atomic number, of course.

An Ounce of Pre-Vention

As quirky as the Project 34 might seem, it’s not the first time that company founder Jon Cusack indulged his long-standing interest in the element. In 2021, he tested the waters with a small 20-unit run of the Screamer Fuzz Selenium pedal and has now tamed the stuff further to tap levels of gain running from pre-boost to light overdrive. Having used up his supply of selenium rectifiers on the fuzz run, however, Cusack had to search far and wide to find more before the Project 34 could launch.

“Today they are usually relegated to just a few larger industrial and military applications,” Cusack reports, “but after over a year of searching we finally located what we needed to make another pedal. While they are a very expensive component, they certainly do have a sound of their own.”

The control interface comprises gain, level, and a traditional bright-to-bassy tone knob, the range of which is increased exponentially by the 3-position contour switch: Up summons medium bass response, middle is flat response with no bass boost, and down is maximum bass boost. The soft-touch, non-latching footswitch taps a true-bypass on/off state, and power requires a standard center-negative 9V supply rated at for least 5 mA of current draw, but you can run the Project 34 on up to 18V DC.

Going Nuclear

Tested with a Telecaster and an ES-355 into a tweed Deluxe-style 1x12 combo and a 65 Amps London head and 2x12 cab, the Project 34 is a very natural-sounding low-gain overdrive with a dynamic response and just enough compression that it doesn’t flatten the touchy-feely pick attack. The key adjectives here are juicy, sweet, rich, and full. It’s never harsh or grating.

“The gain knob is pretty subtle from 10 o’clock up, which actually helps keep the Project 34 in character.”

There’s plenty of output available via the level control, but the gain knob is pretty subtle from 10 o’clock up, which actually helps keep the Project 34 in character. Settings below there remain relatively clean—amp-setting dependent, of course—and from that point on up the overdrive ramps up very gradually, which, in amp-like fashion, is heard as a slight increase in saturation and compression. The pedal was especially fantastic with the Telecaster and the tweed-style combo, but also interacted really well with humbuckers into EL84s, which certainly can’t be said for all overdrives.

The Verdict

Although I almost hate to use the term, the Project 34 is a very organic gain stage that just makes everything sound better, and does so with a selenium-driven voice that’s an interesting twist on the standard preamp/drive. For all the variations on boost and low/medium-gain overdrive out there it’s still a very welcome addition to the market, and definitely worth checking out—particularly if you’re looking for subtler shades of overdrive.