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Jazz guitarist Peter Van Wood had a modified Hammond organ expression pedal; he recorded in 1955 a version of George Gershwin's "Summertime" with a "crying" tone, and other recordings including humorous "novelty" effects.A De Armond Tone and Volume pedal was used in the early 1960s by Big Jim Sullivan, notably in some Krew Cats instrumental tracks, and in Dave Berry's song "The Crying Game".This was later simulated with electronic circuitry for the electric guitar when the wah-wah pedal was invented.It is controlled by movement of the player's foot on a rocking pedal connected to a potentiometer.but when those were gone, the worst inductor in Crybaby history took its place. a nice cap, but not the mighty tone of the previous Thomas foils!The 5117 part number was retained for the transistors, but these babies do not have the character or even the tall size of the 70s 5117s.In ’83 or so a new PCB supplier was brought in, with weird traces and rapid revisions.
Page insisted on testing this bread-boarded circuit while he played his saxophone through an amplifier.While creating the Vox Amplifonic Orchestra, the Thomas Organ Company decided to create an American-made equivalent of the British Vox amplifier but that was transistorized (using solid state circuits), rather than vacuum tube, which would be less expensive to manufacture.During the re-design of the USA Vox amplifier, Stan Cuttler, head engineer of Thomas Organ Company, assigned Brad Plunkett, a junior electronics engineer, to replace the expensive Jennings 3-position MRB circuit switch with a transistorized solid state MRB circuit.Wah-wah effects are used when a guitarist is soloing, or creating a "wacka-wacka" funk-styled rhythm for rhythm guitar playing. Plunkett at Warwick Electronics Inc./Thomas Organ Company in November 1966.This pedal is the original prototype made from a transistorized MRB (mid-range boost) potentiometer bread-boarded circuit and the housing of a Vox Continental Organ volume pedal. Country guitar virtuoso Chet Atkins had used a similar, self-designed device on his late 1950s recordings of "Hot Toddy" and "Slinkey".