This automatic mixer is missing most of its caps, and the pots are a bit noisy when turned. But otherwise it seems to be functional. Replacing the caps would be nice but not essential. And cleaning the pots would be necessary if this is to be used actively (using them to adjust volume during use.) But once set, there's no extra noise.

The Shure SCM810 8-Channel Microphone Mixer provides a feature set and sonic quality suitable for any sound reinforcement scenario. The SCM810 features 8 Mic/Line level inputs via Phoenix Block Connectors. All inputs are balanced and provide phantom power for condenser microphones. There are 8 direct outputs (1 per input channel) for direct routing of incoming signal to recorders monitors etc. Low-cut filter and High-shelving EQ switches are provided on all input channels. In addition to the mixers sonic quality, the SCM810's automatic features offer complete, hands free operation between multiple microphones.