![]() This is meant as a “pretty” fuzz a la 60’s-70’s classic rock/psychedelic rock. There are many colors of tone available with the impedance and gain controls…they are very interactive. It will sound different, and I think more useful, than the classic versions. The circuit has been tuned to be used as a rich sounding clean boost, an overdrive, all the way up to an aggressive fuzz with some octave overtones. After the pickup simulator circuit, we have added an “Impedance” control, which simulates rolling down the guitar volume to get that tight sparkly sound…without adjusting your guitar volume….which you can still do and still sounds great. These two additions make compatibility with other pedals possible without losing the desired sound. This buffer feeds a Jack Orman style passive pickup simulator circuit (an audio transformer set up as an inductor, a resistor, and a capacitor). ![]() We installed a class A buffer in the very input of the Germanium Fuzz. We went to some extremes to keep the blessing and lose the curse. The 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 sounds nasty (in a bad way) if there are buffers or pedals before it in a signal chain. We have found there is a 20˚F difference between a black pedal and a white pedal in direct sunlight. There are two colors: Studio Black is not meant for direct sunlight, Solar White is fine with it. This pedal is designed to operate between freezing and 100˚F but might still sound fine outside this range. ![]() The heaters will warm the transistors enough to still be effective on a sunny stage, but far cooler than anything that would harm the transistors. ![]() Expect the LED to toggle back and forth every so often while the pedal is on…that is how you know its working. When the LED turns green, the warmer is off because the correct bias and hFE have been set. When the LED is orange, the transistors are warming up to increase their hFE (transistor gain) and to shift the bias point to the correct voltage. The bias of the transistors in this pedal is automatically regulated by a circuit that GENTLY warms the transistors to a preset operating point using analog components, and ensures a consistent sound, no matter the external temperature. THE FIRST FUZZ PEDAL WITH AUTOMATIC THERMAL BIAS TECHNOLOGY They are set up in the ubiquitous 60’s circular fuzz topology, and tuned for good sound, and include some additional oddities aimed at solving the issues that prevent more widespread use of Germanium tailed below. They have been graded for gain and leakage and carefully matched to sound their best. This pedal is designed around two germanium 2N527 OR 2N404 Germanium Transistors. Read on only if you want some excellent primary source material for an online fuzz thesis… The color of the LED indicator light might change. Good time to tune your guitar and grab a beverage. ![]() IMPORTANT: after plugging it into power (9vdc only), it will take 2-3 minutes on average to sound correct. ![]()
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