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This pedal is designed around two germanium 2N527 OR 2N404 Germanium Transistors. They have been graded forgain and leakage and carefully matched to sound their best. They are set up in the ubiquitous 60’s circular fuzztopology, and tuned for good sound, and include some additional oddities aimed at solving the issues that preventmore widespread use of Germanium devices....detailed below.THE FIRST FUZZ PEDAL WITH AUTOMATIC THERMAL BIAS TECHNOLOGYThe bias of the transistors in this pedal is automatically regulated by a circuit that GENTLY warms the transistors to apreset operating point using analog components, and ensures a consistent sound, no matter the external temperature.When the LED is orange, the transistors are warming up to increase their hFE (transistor gain) and to shift the bias pointto 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. Theheaters will warm the transistors enough to still be effective on a sunny stage, but far cooler than anything that wouldharm the transistors. This pedal is designed to operate between freezing and 100˚F but might still sound ne outsidethis range. There are two colors: Studio Black is not meant for direct sunlight, Solar White is new with it. We havefound there is a 20˚F difference between a black pedal and a white pedal in direct sunlight.INPUT IMPEDANCEThe low input impedance of the classic two transistor germanium fuzz circuit is both a blessing and a curse….a blessing because it can yield a tight sparkly clean tone when guitar volume is rolled down, and a curse because it soundsnasty (in a bad way) if there are buffers or pedals before it in a signal chain. We went to some extremes to keep theblessing and lose the curse.We installed a class A buffer in the very input of the Germanium Fuzz. This buffer feeds a pickup simulator circuit (anaudio transformer set up as an inductor, a resistor, and a capacitor). These two additions make compatibility withother pedals possible without losing the desired sound. After the pickupThe Germanium Fuzz is a fuzz pedal. The knobs change the sounds. IMPORTANT: after plugging it into power (9vdconly), it will take 2-3 minutes on average to sound correct. Good time to tune your guitar and grab a beverage. Thecolor of the LED indicator light might change. Don’t turn the internal trimmer. THAT’S IT. Read on only if you wantsome excellent primary source material for an online fuzz thesis