TELEPHONE No. 262
|Telephone No. 262CB was a combined handset
telephone and Repeater Telephonic (amplifier) for
customers with weak voices. The phone could be fitted with a
dial if required. The telephone is a modified
The amplifier unit is secured beneath the telephone in the place normally occupied by the bell-set of a combined sot telephone and has a moulded cover similar to a bellset cover but modified to take the amplifier switching key.
The amplifier has a single stage employing a miniature directly-heated pentode type Hivak XY. It is operated by dry batteries housed in a battery box which also contains a bias resistor and capacitor. The degree of amplification is variable and controlled by a potentiometer mounted on a bracket fixed to the telephone cradle.
A Bellset No. 26 was used for the incoming ring and this would be mounted on an adjacent wall.
The battery box was installed close by. The batteries required to
operate the amplifier were:-
Introduced circa 1952, but no indication of it's life span or uptake.
Wired to Diagram SA4117.
Drawing - 90347
Specification - D1944.
Last revised: January 30, 2021