These two French military HF receivers are slightly different prototypes but with many similarities.
Probably designed in the late 60s and using subminiature tube racks.
One of the prototypes is equipped with molded blocks marked CSF.
They could have been made by Lagier as these units are using not only the very same front buttons that those of the TR-TG-2A but also the its quartz filter design.
New: Documentation confirms they are prototypes for a transistor-based successor to the TRTG2A's receiver.
