RPM

RPM stands for revolutions per minute, the number of times a turntable's platter spins around in sixty seconds. Vinyl records are pressed to play back correctly only at a specific RPM, and the three standards used through the vinyl era are 33 1/3 for full length LPs, 45 for most 7 inch singles, and 78 for the shellac records made before vinyl took over. Getting the speed wrong turns music into an obviously off pitch, faster or slower version of itself.

The right speed matters because pitch and tempo are tied directly to how fast the groove passes under the stylus. A turntable's motor and pulley or direct drive electronics are built to hold one of these speeds steady, and most modern turntables offer both 33 1/3 and 45 with a switch, while 78 support is rarer and usually limited to higher end or vintage-style models. Fine pitch control, when a turntable has it, lets you nudge the speed slightly for personal preference rather than correcting an actual fault.

When shopping, check which speeds a turntable actually supports before assuming it plays everything in a collection, especially older 78s which need a different stylus and equalization too. If a turntable seems to run consistently fast or slow across all speeds, that usually points to a drive or motor problem rather than a setting you can fix by ear. A common mix-up is buying 45 singles without checking whether the player needs a separate adapter for the larger center hole.