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It appears to be two, 15MHz amplifiers to convert a single channel scope into a four channel display. In other words, it is a pair of the electronic switches that were common for early single channel scopes.

They were also kit versions and construction projects. They used a twin Triode to create an adjustable square wave to drive the chopper, and each input had an amplifier with adjustments for both gain and position. Heathkit made the S1, S2 and S3, ID22, models, and at least the S3 schematic is on line because I have a copy of its schematic.

There is a description of this item in a book about scopes:

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Here is the Heathkit S-3S schematic:

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You have an advantage in having two switches, in that you can compare them to locate problems. As always, make sure the DC rails in the power supply are clean. The filter caps are likely 50 years old, or more.


Michael A. Terrell