Hi Bob,

It just so happens that I have finished work on  "The Pilot's Preference", the Learavian RM-402C "Beacon, Broadcast, and Airline Receiver".  Cool piece.  It's an AC-DC-Battery 3-way portable, receive-only. Has an intercom feature built in.  It was apparently made for private aircraft that had no radio built-in.  Came with a resistance line cord that had been chopped off. The 50B5 and 35W4 were series filament-fed by way of that cord.  That 85 volts was easy to come by using a tiny modern device.  Fun piece.  Had to build a loop antenna for the one that was missing.

It is about as much fun to play with as an ARC-5.

73, Rich KB8TAD