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STC joined other manufactures who presented prototype "Boudoir type" telephones
in response to a brief from the GPO and the
Council for Industrial Design for evaluation under
SCP201.
STC produced a number of phones called the Fairyphone, but the final design was decided (adopted by the the GPO who called it the Trimphone) it did not resemble the any of the initial phones STC presented. STC opted to call the phones they sold privately, for public network use, the Deltaphone and for internal use the phone was called the Deltaline. A press button variant was produced later called the Quickstep Deltaphone. It was winner of Design Centre Award in 1966. Designed by Martyn Rowlands the Deltaphone or 'Trimphone' came in 3 colour combinations (Grey-White, Two-tone Blue and Grey Green) although later a wider range of fashion colours was introduced. Its distinctive design and ring-tone (a 'tone caller' instead of a bell) made it a popular product which remained in production into the 1980s. It was produced with an ABS plastic body and handset, with polycarbonate switching bars and dial finger plates. Introduced in 1965. Dimensions:-
STC Deltaphone Technical Manual (STAA 66) Models
Mark VI Deltaphone Codes
66-LAU-67 The first suffix letter denotes the climatic rating. The second letter, the type of dial and the third suffix gives the colour. The dial finger plate and cradle bar are matched in tinted transparent plastic.
Deltaphone in blue
Deltaphone with packaging
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STC
DELTAPHONE & DELTALINE
