ThroBak Overdrive Boost details and Colorsound Power Boost / Overdriver History. Throbak Electronics offers the Overdrive Boost guitar effects pedals. Throbak has reproduced and improved the circuit of the original Colorsound Power Boost guitar effects pedal (also known by the name Colorsound Overdriver). The original was used by David Gilmour, Jeff Beck and other pros to become an integral part of 70's signature tones. The Colorsound Power Boost and Colorsound Overdriver were also favorites of Marc Bolan and is considered by many to be the best overdrive/booster ever made. Tones still in demand in the pro guitar shop of today. This vintage circuit was made popular for it's ability to bring body, dimension and tonal flexibility to a single channel tube amp. This Silicon transistor circuit can give everything from a substantial and extremely transparent clean boost to all out silicon fuzz and every tonal variation in between. The flexible and interactive bass and treble controls can add treble bite and chime to a overly bassy amp or add a meaty low end to an amp that sounds too thin. This pedal is almost like it's own little amp in a box that will bring amazing clean and distorted tones to any tube amplifier. In keeping with our Signature sound philosophy we have added several improvements and tweaks to the Overdrive Boost guitar effects pedals that let you tailor your own signature sound with this tonal giant. First we have added a master volume. The original Colorsound Power Boost and Colorsound Overdriver usually lacked a master volume control so we added one to the Overdrive Boost. As with the Throbak Fuzz Haze and Stone Bender a Pre Gain switch has been added giving more control to low note definition of distorted tones. Thirdly a switchable Germanium transistor has been paired with a Germanium diode and added to the circuit. The original circuit remains in tact but when switched on, the Germanium pair adds flexibility way beyond that of the original Colorsound Overdriver, adding the edgy, compressed distortion tones you can only get from Germanium. In addition to these features each silicon transistor has it's own internal trim pot to ensure that each pedal is perfectly tuned. Give your non-master volume amp the control of a master volume amp. When paired with a great non-master volume amp like the ThroBak 18 Watt Classic Combo, the ThroBak Overdrive Boost guitar effects pedals let you crank your amp to 10 and still play at bedroom levels, while keeping the great cranked tone. The Overdrive Boost effect pedal gives the same rich, complex tones usually only associated with an attenuator, but cheaper more compact and more tonally flexible when compared to an attenuator. The combination of the master volume and the Germanium pair gives this attenuator like effect. This attenuator like effect is only made possible with the ThroBak Germanium pair modification. The original unmodified Colorsound Overdriver circuit cannot duplicate this attenuator like effect with a non-master volume amp. Rediscover what Jeff Beck, David Gilmour and many others discovered with the original Colorsound Power boost by getting the Overdrive Boost between your guitar and amp! 3 Carefully selected TO-18 metal can Silicon transistors, as used in the original circuit. Externally switchable pre gain control with internal pot allowing you to dial in the best pre gain for your guitar. Switchable Germanium transistor and Germanium diode pair. Bias adjustment for transistors ensuring a perfectly tuned pedal. Master volume & true bypass footswitch. Gain, Bass and Treble adjustment. 5 year limited warranty.