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First
generation DC code
'A' signalling, table telephone with provision for 4 additional press buttons.
Used in the Langham Exchange
market research trial with the first press button telephone being installed on the 10th
January 1966. Click here for pictures of the
exchange equipment.
The telephone was produced from a Telephone No. 710 but modified
as follows:-
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A push button DC Signalling Unit replaces the dial.
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The dial aperture in the cover is enlarged to cater for the keyset.
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A face plate is clipped over the aperture in the case.
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The Telephone No. 4/726L is fitted with an 18 way line cord.
Superseded by the Telephone
No. SA10023.
Introduced in 1968 and was available in the colours, Grey, Black and
Ivory.
Only used
on the following customers premises:-
BP, Harlow.
BP, Britanica House., London
Midland Bank, Lombard St., London
ICI, Aberdeen.
ICI, Brockley.
For more information see Telephone No. 728.
Circuit diagram - N826 and LD191.
Specification - S937. Supplied by Ericsson,
their Models N2001 - N2005.
Additional information
| Model | Mark | Black | Grey | Ivory | Introduced | Remarks | | Tele 726F | Mk 1 | y | y | y | 10/68 | | | | Mk 2 | y | y | y | 4/73 | | | Tele 726L | Mk 1 | y | y | y | 10/68 | Enquiry button fitted | | | Mk 2 | y | y | y | 4/73 | Enquiry button fitted | | Tele 1/726F | Mk 1 | y | y | y | 10/68 | Bell loudness control fitted | | | Mk 2 | y | y | y | 4/73 | Bell loudness control fitted | | Tele 1/726L | Mk 1 | y | y | y | 10/68 | Bell loudness control fitted | | | Mk 2 | y | y | y | 4/73 | Bell loudness control fitted | | Tele 2/726F | Mk 1 | y | y | y | 10/65 | Teledictation Control fitted | | | Mk 2 | y | y | y | 4/73 | Teledictation Control fitted | | Tele 3/726F | Mk 1 | y | y | y | 10/68 | As 2/726 but with bell loudness control | | | Mk 2 | y | y | y | 4/73 | As 2/726 but with bell loudness control | | Tele 4/726L | Mk 1 | y | y | y | 10/68 | Secretarial telephone with 6 press buttons | | | Mk 2 | y | y | y | 4/73 | Secretarial telephone with 6 press buttons | | Tele 4/726F | Mk 1 | y | y | y | 10/68 | Secretarial telephone with 6 press buttons | | | Mk 2 | y | y | y | 4/73 | Secretarial telephone with 6 press buttons |
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