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UK Phone Voice Scrambler 740 → ← SA 5063/1
Used as Privacy Set voice terminal
- this page is a stub
In the late 1950s, the GPO made the Frequency Changer — meanwhile
renamed Privacy Set — to commercial parties. British manufacturer
TMC, for example, marketed the equipment under the name
Secraphone
from the late 1950s to the late 1970s.
Others kept using the name Privacy Set.
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Privacy Set No. 7, 8 and 9 could all be used with the
existing SA5030 voice terminal,
but from approx. 1962 onwards,
Telephone No. 710 and No. 740 were used as modern a replacement.
The introduction of the 710 and 740 telephone sets more or less
coincided with the arrival of Privacy Set 8 and the
replacement of manually switched and Local Battery (LB) systems.
For use with a Privacy Set, the No. 710 or 740 telephone set had to
be modified. Like with the earlier SA503x terminals, the push-buttons
at the top were configured for switching between clear and
scrambled speech.
The image on the right shows a genuine No. 740 that turned
with a Privacy Set No. 8 up in June 2013
at Gildings Auctioneers in the UK.
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© Crypto Museum. Created: Wednesday 26 May 2021. Last changed: Tuesday, 10 August 2021 - 16:35 CET.
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![Telephone No. 710. Copyright Gildings Auctioneers [10].](img/phone710.jpg)