From Benson Amps
THE BASICS
The Stonk Box is our second Automatic Thermally Bias fuzz pedal, so after plugging it into power (9vdc only), it will take 2-3 minutes on average to sound correct. The color of the LED indicator light might change. Don’t turn the internal trimmer. THAT’S IT. Read on if you would like to...there’s some good stuff.
SUMMARY
Like the Germanium Fuzz before it, the Stonk Box attempts to take a classic 1960’s fuzz design, and bring the sound into the modern world without bringing any along the flaws and inconsistencies of the original. In this case, we set our eyes on the MK1 fuzz (which is itself a modified version of the very first fuzz ever). We kept the original controls (FILTER and VOLUME), and added a TONE control and a TRIM control to expand the palette of sounds available. Buffer and pedal order friendly (but with no pickup simulation, we had to tweak the output circuit this time). The original circuit is considered one of the hardest of the classic fuzzes to get right because of the difficulty in transistor selection...with our patented technology we can do it easily and consistently...for the first time ever!
AUTOMATIC THERMAL BIAS TECHNOLOGY
The bias of the transistors in this pedal is automatically regulated by a circuit that GENTLY warms the Germanium transistors (2N404 OR 2N527) to a preset operating point using analog components, and ensures a consistent sound, no matter the external temperature. When the LED is amber, the transistors are warming up to increase their hFE (transistor gain) and to shift the bias point to the correct voltage. When the LED turns green, the warmer is off because the correct bias and hFE have been set. Expect the LED to toggle back and forth every so often while the pedal is on...that is how you know its working. The heaters will warm the transistors enough to still be effective on a summer stage, but far cooler than anything that would harm the transistors. This pedal is designed to operate between freezing and 100F but might still sound fine outside this range....up to about 120F where we’ve found germanium straight up ceases to function...which can happen if it’s left in the sun.
