TELEPHONE No. 25

A wooden cased Magneto wall telephone complete with bell and generator.

Used on Magneto and CBS exchanges.

Originally called the "Post Office Telephone with Magneto Bell and Generator" it was later renamed in 1911 as the Telephone No. 25.

Consists of a Telephone No. 21, Bell No. 11A and Generator No. 2 or 4 fitted to a bespoke backboard/cabinet.

Two cells "Leclanche, Agglomerate, 2 block" are fitted in the bottom of the cabinet.

Superseded the "Instruments, Subscribers, Wall, N.T. No. 17" in 1914.

Telephone includes (1910):-
1 x Telephone, PO, for Granular Transmitter.
1 x Bell, Magneto, Type 2004 (1000ohms).
1 x Generator No. 2.
1 x Generator, Bracket, 3 Terminal.
1 x Bell, Receiver A, C or D.
1 x Wall Frame 28" x 10".
1 x Deckert Transmitter or Transmitter, Inset, Ebonite complete.

Telephone includes (1911, 1912, 1913 and 1915):-
1 x Telephone No. 21, incomplete.
1 x Bell No. 11A.
1 x Generator No. 2A or 4C.
1 x Receiver, Bell No. 1A or 2B.
1 x Transmitter No. 3.
1 x Wall Frame 28" x 10".

Circuit Diagram - N125 (Dated 1917).

Circuit Diagram - TL392A.

Fitted with a Receiver, Bell No. 1A.

 

Last revised: November 17, 2025