| 摘要 |
A modification unit for a musical instrument amplifier includes a modification circuit and a connector for connecting the modification circuit to a tube socket in place of one of the tubes in the pre-amp stage of the amplifier. The pre-amp includes at least a gain stage with a gain tube and a socket for receiving the gain tube where the tube socket has at least one plate contact, at least one cathode contact and at least one filament (heater) contact. The modification circuit includes a jack for receiving an electronic signal originated by the musical instrument and a circuitry for modifying the received electronic signal to generate a modified signal. The connector for connecting the modification circuit includes a first lead interconnected to one filament contact for providing ac power to the modification circuit, second lead interconnected to one of the plate contacts for outputting the modified signal to the amplifier and providing dc power to the plates of the various tubes in the modification circuit and a third lead for interconnecting the cathode contact to ground.
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