were the first systems used for mastering audio compact discs in the early 1980s by many major record labels, with the final U-matic 1600-format digital audio tapes being sent to CD pressing plants to be recorded to a glass master disc used for making the replicated CDs.

Several semi-professional/consumer models of PCM adaptors were also released by Sony:

* Sony PCM-1 (introduced in 1977)
* Sony PCM-10 (1979)
* Sony PCM-F1 (1982, the first consumer-marketed

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