The 903-A Random Signal Generator is a pretty simple module.

Moog did not give modules serial numbers until 1967 and started at serial 1001 so this is the 6th 903-A produced after assigning serial numbers.

This PCB has the edge fingers.  Many of the Moog modules have a separate PCB with the edge fingers.

White noise on top and pink noise on the bottom.  This is a triggered view so you can see the gap on the left at the trigger point.

An expanded view of the noise without the trigger discontinuity.

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