|Transmitter Inset No. 13
Carbon granule transmitter used in all Bakelite handsets and some
early 700 types.
There appears to be two variants the /1 was all metal construction,
whilst the /2 had the protruding back part made of plastic.
Transmitter Inset No. 13A was used in the Transmitter No. 23.
Transmitter Inset No. 13AA was used in the Transmitter No. 23A.
Transmitter Inset No. 13C was used initially on 700 type telephones and is
identifiable by a screw-nut, located on the spring plate, on the rear of the unit.
There is a also a nut on a threaded pin pushed into the centre hole.
Superseded the Transmitter Inset No. 10.
Superseded by the Transmitter Inset No. 16 for 700 type telephones.
Introduced in 1939.
Ericsson Code No. N7752L (No. 13C).
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