TELEPHONE No. 736
|Single button telephone similar to Telephone No. 706 except that the cover is retained by one fixing screw at rear of case,
and the circuit board is reduced in size, with smaller components fitted.
The prototype was approved in September 1964 and supplied in Grey and Ivory colours.
This was a trial telephone (SW 2067) which turned into the Telephone No. 746 on general release. Board approval for the Telephone No. 746 was given in October 1966, which retained the field trial circuit board but included a sealed switch instead of the open style spring set.
In June 1964 the Subscribers Apparatus Group intended to go to field trail in the North Eastern Region, with 5000 ivory and 5000 grey coloured models.
Why the change - probably to reduce the weight, reduce the production costs and facilitate the introduction of smaller electrical components. The introduction of an integral handle was also considered and one design shows a handled moulded into the casing like the telephone No. 746.
The phone was produced by AEI.
In 1965, Automatic Electric Laboratories (AEL) went to court over patent infringement. This was with respects to the carrying handle and handset "Walk on". The GPO Engineering Department then modified the handle to avoid any original or newly disputed patent claims.
Circuit diagram - N836.
Last revised: October 27, 2022