hifi engine

APT Professional Amplifer 1



APT Professional Amplifer 1

I've never seen any other one lttiike it. It is an APT Corp APT-1 but modified by APT to include a rotating knob with the selections as follows: Stereo: 4 - 2 - 1 - ½. And for Mono: 2 - 1 - ½ - ¼.

Does anyone out there know how this knob should be set for and under what circumstances for each setting?

Thanks very much
JT