I believe some stations had a 1/4 inch machine with variable speed. Used to rescue recordings made on a Uher with failing batteries by reducing the tape playback speed so that voices sounded ok and dubbing it off to another machine recording at normal speed.
I once persuaded my wife that we should record her lengthy (for a feature programme) interview with Susan Hampshire in stereo, rather than mono, so I went with her to do the balance myself. On the station's only stereo Uher. The one nobody ever used. Or put new batteries in...... Of course I ended up having to dub the tape and sort the ghastly speed problems by holding my finger against the edge of the spool to slow it down. (It worked but was a total nightmare!) No varispeed at Radio Clyde in 1975.
Someone asked about grams in TV. Around 1971 I visited the BBC's studios at Beechgrove in Aberdeen. Not only was the TV studio still working in monochrome, but both the radio and TV studios were equipped with gram units that could only play at 78rpm. Effects discs and background music was still played off 10 inch 78rpm discs. It has to be said that in the late 60s, libraries like ******* released their music on vinyl 78rpm discs that sounded astonishing, and still do. I've done some remastering recently from some of these discs and the quality is vastly superior to 33rpm discs, and very much less prone to surface noise and clicks.
The views expressed on this forum are entirely my own.