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SECRECY SCRAMBLER SET No 8, 1950's
The Secrecy Set No8 distorts the signal to an unrecognisable mush, the circuit is then reversed at the receiving end.
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It would not be difficult to UN-distort the message that is sent down the line, if you had the expertise. This machine is a Transistorised version of the valve equivalent used after the war, and supplied by the British Post Office for commercial use only.
The Manufacturer E.M.T. is a mystery, it is a possibility that it could be EMI who made it, the last letter 'T' being a code, as in War time Utility sets, that used a letter codes to indicate the maker. Off course as this is a Secrecy set it would not be good practice to divulge the maker.
This item can be demonstrated.