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Aries modules were available both as kits and factory modules. This module sold in 1975 for $39.50 in kit or $79.00 assembled and raised in 1977 to $68.00 in kit or $121.00 assembled. The module includes a 4 jack patch panel and two uncommitted attenuators.
Aries AR-315 Documentation (compliments of Mark Glinsky)
This is a pretty simple design and both sides of the PCB are easily accessible.
The PCB is a single sided tin with no solder mask. Care is required when doing repairs as the pads do lift easily.
The AR-315 can handle signals up to +/-10V. Here it is modulating a sine with a lower frequency triangle.
Calibration is straightforward. This is the adjustment of the X null which doesn't quite zero out.
This is the adjustment of the Y null which does zero out.
The other two adjustments are offset and gain which are set with a DMM.