The Moog 905 Reverberation Unit has a single wet-dry control for processing the signal.  The output is out of phase with the input.  There are a few errors on the schematic so I corrected them in this PDF file.

Corrected 905 Reverberation Unit schematic  Updated

There is not much circuitry on this PCB.  Notice the incomplete etching of the PCB.

The reverb tank barely clears the output jack.  The jacks on the reverb tank are not used and the connections are soldered directly to the terminals.

The module uses a Gibbs spring reverb that is mounted at a diagonal across the PCB.

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