military: BC-659: matching linear amplifier

In my collection, I have a R.F. amplifier matching the BC-659 in a very similar design.
This set with the designation "Ampli H F AM 102 A" has been in use by the french "Gendarmerie Nationale", but I suspect it also has a military origin.
It comes with a matching BA-275-A mains power supply in the same cabinet, and a battery power supply  AA-23-A.

The meter is marked Signal Corps.

Does anyone have the original Technical Manual matching the BC-659, maybe there are hints about this power amplifier. I would better make a new model proposal when the U.S. Signal Corps designation is clear, I'm not sure whether the designations on the set are U.S. designations or from French Police forces.

Kind regards Martin Boesch

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