Profile: S Five Electronics specializes in designing and developing electronic test fixtures, industrial controls and consumer devices. We offer devices for the hearing impaired, tube amplifiers, gauss meter and equipment wiring test set. We offer speech adjust-A-tone models, voice magnifier and related accessories including a bone conduction transducer. Our 12G stereo integrated tube amplifier is designed to operate from the audio output of CD players, and uses RCA jacks for the inputs.