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KY-585/U Voice Coder

ky585.jpg
KY-585 with carrying case. It was an unclassified device. (Photo courtesy Ken Sutterfield)

This is an analog to PCM (pulse code modulation) and PCM to analog voice converter which had excellent clarity in its day. It used flat-pack, gold-plated IC chips which did not plug into sockets but were soldered into the boards. Troubleshooting was purely board level replacement and front panel bulb replacement.