via this auction

"Countryman released the first commercial phase shifting devices beginning with the Type 967 Phase Shifter around 1967; The 968A is the last model in this series, released around '71. Like the 967 and 968, the 968A uses an internal Envelope Follower rather than a cyclic LFO for phase modulation. There is also a CV input on the front panel, along with the audio input and output.
Besides being one of the very first of its kind, and having a very unique sound, the 968A is designed in a way that makes it particularly suited to experimental audio processes and special audio effects (as opposed to and different from your average stomp box phaser). There's not a lot of information online about this rare device, but what is available is mostly concerning it's experimental applications.
The 968A was used in a number of early electronic music studios including the BBC Radiophonic Workshop. It's featured in this BBC TV 70's documentary film." [posted here]
Stay tuned for the "how the voice of the Cylon was made" documentary almost done!
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