This Shure M688 mixer is in excellent operational and cosmetic condition. All channels have been tested and are working properly.

The original manual with schematic and parts list is included.

The M688 accepts four high or low impedance Dynamic, Ribbon or Condenser (no phantom power provided) microphones through four transformer-coupled microphone inputs, each with its own individual volume control. Inputs #1, #2 and #3 have slide switches for left channel or right channel output; input #4 features a pan control which adjusts the apparent location of Mic. #4 to the left channel, the right channel, or anywhere in between. Stereo high-level auxiliary inputs accept signals from a tape recorder, tuner, or the output of a stereo phono preamplifier. A ganged stereo master volume control simultaneously adjusts the level of all inputs.

Outputs include stereo auxiliary output jacks which feed a power amplifier or the auxiliary or tuner inputs of an amplifier or tape recorder. A high or low impedance mono microphone level output (mixed L + R of all sources) feeds an amplifier or tape recorder microphone level input. The auxiliary outputs may be converted to monophonic output by a Mono-Stereo selector switch.