[heyman]

There is a Ground lift switch on the box itself.. The Custom cable is extremely important as well.. No transformers.. You can see the ground lift swtich in the pic I attached..



Here is some info from the web..

"The single transistor unity gain buffer circuit utilized in the STD is mounted inside the special copper tipped phone plug itself. This elegantly simple buffer circuit was designed to load the instrument pickup properly for a natural frequency response regardless of cable length and also will eliminate susceptibility of the cable to extraneous noise sources."


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