TELEPHONE No. 133

Laryngaphone wall telephone.

These were used in noisy areas.

Used on CB and Auto systems.  The CB variant had a notice frame in place of the dial.

The handset is a Telephone No. 186, which used a Transmitter Inset No. 11.

Telephone consists of:-
Cord, Instrument No. 222.
Cord, Instrument No. 442.
Cord, Instrument No. 509 (if dial fitted).
Condenser M.C. No. 30 (2uf).
Bell No. 1A.
Telephone No. 186
Receiver, Watch No. 1B.
Coil, Induction No. 14.

Circuit diagram - N233 (Dated 1931).

Possibly made by TMC.

Last revised: January 24, 2025