Date Region Description Price Seller
USAInternal pot was moved to the outside to have more cont...$129.00
USAOriginal 70's Doctor Q Envelope filter. This pedal has ...$125.00
USA Pot dates to 1977. Doctor Q pedal is used and in good...$159.00
USAOriginal pre owned Electro Harmonix Dr. Q envelope filt...$59.00
EUElectro-Harmonix Doctor Q Envelope Filter 1977 made in ...$165.32
USA1978 Electro Harmonix Doctor Q envelope filter in very ...$150.00
USAFun pedal. everything works. ![Electro-Harmonix Doctor...$92.00
EUI am selling a first version Electro-Harmonix Doctor Q ...$201.72
USAGood working condition, cosmetically what you'd expect ...$80.00
USAOriginal pre owned Electro Harmonix Dr. Q envelope filt...$59.00