Hello Gilles.
Nice find. As Bruce mentioned, it is one of a three version family of post war US FM military radios: RT66, RT67 and RT68. All were identical in appearance but worked on progressively higher frequency ranges with a little bit of overlap. There were also two identical looking power supplies available for it, one 12 volt and the other 24 volt. They came out in the late 1950's and peaked in use by the end of the 1960's. Quite common at the height of the Vietnam War. The contemporary British set would be the C42, and I think the RT68 actually works part of the same frequencies as the C42.
The manual Brian has is probably the one covering all versions of the set and would be very useful for you. In addition, Fair Radio Sales in Lima, Ohio still carry a good selection of accessories for these radios.
I had an RT68 many years ago and gave it to a friend for some 19-set bits. He still uses the RT68 on the air and quite likes its capabilities.
David
|