Hi Marty sorry I wish I had more info to add to the thread but I as well have very limited reference material I do know that one of the most common type of head set receivers used were the R-14's and one of the manufacturers were the Consolidated Radio Product Company and they were produced under contract for the US Signals Corps.
They can be found with the earlier issued Resistal goggles that were issued in 1942 The US army later adopted Polaroid general purpose goggles .
I did find this link rather helpful and informative .
BIG-RED-ONE_M1938 TANK HELMET INFO PAGE
Regards Mark
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