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No. 6B →
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Frequency Changer No. 6A
Telephone scrambler · 1940 - this page is a stub

This improved version was introduced in August 1940 for use on CB/Auto or LB installations. It was suitable for the 200-250V AC mains only and had an isolated power transformer, which made it much safer for maintenance engineers. Like the No. 6 it is built around CV1732 valves.

There were several other design improvements, but a detailed description of them is currently unavailable. Like the No. 6, the 6A is housed in a wooden enclosure.

At present, no image of this version is available.


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Crypto Museum. Created: Wednesday 26 May 2021. Last changed: Wednesday, 28 July 2021 - 05:33 CET.
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