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Different Album Speeds
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The vinyl records came in different sizes and different rotations per minute or rpms. In between the years of 1900 and 1925 most commonly records were created in 74-82 rpms. Then in 1925, they changed to 78, now 78 was the standard because of the way the electric powered the turntable motor. The motor ran out at 3600 rpm which produced a 46:1 ratio which equaled out to 78 rpms.
The more record being produced the more sizes of records came out. The 12 inch record was produced at 33-1/3 rpm and the LP was the most common form of record used. LP which means long play. The 7 inch record was 45 rpms; the 45’s were called single records because they could only fit one song on each side. 45’s unlike 33-1/3’s were also available in EP, which means extended play.
In the 1950’s and 60’s, in the United States home there were record players or stereos that had these standard features the 3 or 4 speed player changer and a combination cartridge for the microgroove styles and an adapter for the 45’s, usually a small round disk, you place in the middle of the disc so it would fit on a standard size record player. The speed for the record were tested and chosen to get the best sound possible and yes, there were times when people played the records at the wrong speeds mainly for fun.
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