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No. 6AA →
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Frequency Changer No. 6B
Telephone scrambler · 1940-1942 - this page is a stub

Introduced in September 1940, this version was nearly identical to the 6A, but was suitable for the 200-250V AC or DC mains and had therefore a live voltage-carrying chassis (like the No. 6).

This version was intended for use in areas that still had a Direct Current (DC) mains power network, with the ability to run from Alternating Current (AC), once the local mains network had been converted.

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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