Talk:Quadraphonic open reel tape

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2601:645:C100:9086:4047:AFD7:6576:6B0F (talk) 03:07, 15 July 2019 (UTC) Pre-recorded stereo 4-track tapes came in both speeds 7.5 i.p.s. and 3.75 i.p.s.[reply]

Pre-recorded quadraphonic tapes also came in both those speeds.