[ARC5] Heater wiring - 12V vs. 24v

[gordon white]

    To my knowledge, the R-148/ARC-5X is the only AN/ARC-5 receiver 
built originally for 14 volts.  The R-148 and the ARA-2 (which is marked 
on the nomenclature plate as 14 volts) are not identical. The R-148 (as 
with the R-23/ARC-5 receiver) has the loop antenna connections and the 
front panel switch. The ARA-2 does not.

    My RAT receivers have no voltage markings on the nomenclature plate. 
Neither do my RAV receivers./I believe the plates are black, and if they 
are blue, the color has darkened up considerably until it looks black.

    Apparently the Navy still had 14 volt planes c. 1939 while the Army 
had gone to 28 volts.

    Of course the Type 12, which were built originally for postwar 
civilian use, were available in 14 volt versions.

- Gordon White