| Receiver Inset No. 1L Used in most early
Bakelite handsets.
Superseded by the Receiver Inset No. 2P.
Used with an Earpiece No. 18 and Diaphragm No. 18.
|
 |
| Receiver Inset No. 2P Used in later
Bakelite handsets.
Used with an Earpiece No. 23 and Diaphragm No. 25.
|
 |
| 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. |
|
| |
|