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audio - What set the speed in a cassette tape recorder ...
https://electronics.stackexchange.com/questions/308073/what-set-the-speed-in-a-cassette-tape-recorder#:~:text=The%20speed%20for%20a%20conventional%20audio%20cassette%20is,to%20in%20order%20to%20take%20up%20the%20tape.
Speed of Audio Tape - The Physics Factbook
https://hypertextbook.com/facts/2000/TienHueyHeh.shtml
"Cassettes run at 1.875 inches per second (4.75 cm/second) while some 4 track cassette devices ("portastudios") run at 3.75 i/s (9.5 cm/s). Reel to reel tape runs at 7.5 i/s (or 19 cm/s) and 15 i/s (38 cm/s)- the latter being the professional standard.
Cassette tape speed problem | Audiokarma Home Audio Stereo ...
https://audiokarma.org/forums/index.php?threads/cassette-tape-speed-problem.983908/
The unit is a Nakamichi Cassette Deck 2. I just replaced the capstan motor. The belt seemed to be fine. I get speed fluctuations and weirdly, if I lift up on the corner of the deck, the speed goes back to normal (possibly normal but definitely better than before I lifted).
audio - What set the speed in a cassette tape recorder ...
https://electronics.stackexchange.com/questions/308073/what-set-the-speed-in-a-cassette-tape-recorder
The speed for a conventional audio cassette is set at 1 7/8 inches per second. As others have said, this is by controlling the rotation rate of the capstan. The take-up spool is on a friction drive, and runs at whatever speed it needs to in order to take up the tape.
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