KY-1 Voice Encryptor

The TSEC/KY-1 was an  all tube,  50 KHz  voice encryptor.  The key generator was an nightmare to adjust. It was controlled
by a key card, just like the KY-3. Because it was 50KHz wide band device, it was restricted for local use to post, camp or stations and hardened sites.

Circa - 1959


1) George Mace  <gmace8(at)>

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May 21/16