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Look up onElectro-Harmonix The Clone TheoryApproximately 1979/1980–early 1980s Matsushita MN3007 with EHX-marked EH3000 PCB Selector labeled “CHOR/VIB – VIB/FLANGE” Revised circuit and control behaviorPot Codes 13777Still produces an authentic analog sound as it was meant to be in the late 70sPots have been serviced and Rate pot replaced.

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