[ARC5] GP-3 vs. GP-7

[Mike Morrow]

Jack wrote:

> The GP-3 is somewhat different than the GP-7. The tuning units do not
> interchange as the plug pattern is different, and the internal layout
> of the transmitter is different.

The very valuable SHIPS 242A that Robert publishes has only the following
for the GP-3:

(1)  It was ordered in 1936.
(2)  It is the first GP-* made by Westinghouse.  All GPs to follow were
     made by Westinghouse.  GP (1934) and GP-2 were RCA.  GP-1 was Western
     Electric.
(3)  It and all other GP-series covered 350-1500 and 3000-9050 kHz.

So there's not much of a clue to your mystery there.  

What I wonder is, do you have a GP-3?  This must be very rare.

73,
Mike / KK5F