Note
Radio, Oct 1941, p. 4.
Lafayette catalog number 87 (New York), p. 59.
Concord catalog 4-46 (1946), p. 107.
In the 1946 Concord catalog, this same device is advertised as being made by Telegraph Apparatus Company.
AC/DC unit in plastic case, with built-in speaker. Toggle switches select on/off, low or high volume, and 600 or 1000 Hz note.
Headphones or a transmitter relay may be connected between the key and keying terminals.
Tube: (1) 117N7GT