Used in most early Bakelite handsets.
Superseded by the Receiver Inset No. 2P.
Used with an Earpiece No. 18 and Diaphragm No. 12.
Note the exposed coils in the centre of the
See picture below for Pole Grinding in the factory.
Receiver Inset No. 2P
Used in later Bakelite handsets.
Used with an Earpiece No. 23 and Diaphragm No. 25.
Note the top of the receiver is enclosed, with a
small air vent.
Receiver Inset No. 2P Mark 3 was introduced
Receiver Inset No. 2/3T
Used in 700 handsets. Introduced in the
1980's as an aid to those who wore hearing
aids. The receiver had a coil of wire wound
around the outside and this would interact with a
hearing aid that was switched to the 'T' setting.
Receiver Inset No. 3T
Used in Headsets and Trimphones.
Receiver Inset No. 4
Used in many 700 type telephones.
Later Receiver Insert No. 4's comprised of a
No. 3T inserted into a plastic housing which
resembled the No.4 - dimension wise.