Why both 33 and 45 ?
Prompted by another recent thread in this section, why were two speeds used for microgroove records... 33 and 45 rpm, when 33 rpm was clearly thought sufficient for good fidelity?
To hazard a guess: 45 rpm gave the right duration to fit a standard song length (that previously went on a 10-inch 78) onto a 7-inch disc. But that then begs the question, why use a 7-inch disc and not something smaller?
Steve
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