Indy Bob wrote:
my first TC had the intercomm, it was hard wired.  I think it was a Heathkit.  The camper was an unknown mfg. but had 1959 stamped on the dataplate.  The intercomm in the camper had a hugh, heavy 10" speaker mounted on the side of a cabinet.  Great sound.  The truck half had a big, steel cased microphone.  Probably weighd two pounds.  Pre-transistor it had a couple of vacuum tubes.  Took a few minutes to warm up.  Just too cool. It went with the camper.  Shoulda kept it.
Just found a complete set of that Heathkit Intercom, and the two different models of the Philips InterCom kit that the Amerigos used.