Teleprinter Model No 7

Teleprinter Model No 7
	; Creed Teleprinter No. 7 with cover removed
Production history
Introduced	1931
Manufacturer	Creed & Company Limited
Produced	1931 - 1960s
Number built	+150,000

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The Teleprinter Model No 7, probably the most famous of the Creed teleprinters, was introduced in 1931 for the new Telex service.^[1] Teleprinters were machines for encoding messages for transmission and reproduction at remote locations. Over 150,000 model 7's were manufactured before production ceased in the late 1960's.

Description

The machine could be fitted with interchangeable platen assemblies for either: Friction feed paper, Sprocket feed paper, or 3/8" wide paper tape. This machine was usually fitted with a 3000 rpm governed motor for operation at 50 Bauds, which is adjustable for operation at 45.45 Bauds. Motors were produced for DC voltage ranges of 24 volts to 220 volts, and for AC voltage ranges of 110 volts to 230 volts. Some machines were fitted with a 3000 rpm synchronous motor for operation at 50 Bauds, and are not directly suitable for operation at 45.45 Bauds without an external AC mains supply running at 45.45 Hz, or some other form of electronic speed conversion. Many variants were also manufactured as the machine was developed and these were denoted with a suffix after the 7. Used by the military, a Teleprinter Model No 7B means that the machine transmits a 7.5 unit character and receives in a 6.5 unit cycle; 66 wpm at 50 Bauds. This is the standard transmit and receive configuration.