Why did 45s have bigger holes?

A larger hole allowed the sudden rotational forces to be distributed over a greater distance (π x 1.5; about 4.712 inches), reducing wear and allowing the hole to stay rounder longer. This was especially important for the jukebox industry. In the 1930s, ’40s, and ’50s, jukeboxes were big, big business.

What is the hole in the middle of a vinyl record called?

A 45 rpm adapter (also 45 rpm record insert, 45 rpm spindle adapter, 7-inch adapter or spider, the common size of 45 RPM records) is a small plastic or metal insert that goes in the middle of a 45-rpm record so it can be played on the standard size spindle of a turntable.

What is the difference between 45 and 78 records?

While the 45 didn’t provide any real benefit over the 78, it was a smaller size. So, by the early 1950s, nearly all record manufactures focused on systems that could play both the 33 and the 45. The faster a record spins, the better it sounds. With that in mind, there is only so much a record can play.

Why do some albums play at 45 RPM?

Scientifically speaking, the longer wave-lengths, the smaller angles in the grooves and the less complicated geometry at 45 RPM help to cut very precise grooves with even the finest details. With a higher rotation speed, of course, the available playing time per side is reduced at 45 RPM.

Why are 7 inch records 45 RPM?

7-inch format The names are derived from its play speed, 45 rpm (revolutions per minute), and the standard diameter, 7 inches. The 7-inch 45 rpm record was released 31 March 1949, by RCA Victor as a smaller, more durable and higher-fidelity replacement for the 78 rpm shellac discs.

Why are 7 inch records 45 rpm?

Are 33s bigger than 45s?

The size is the most notable difference in the performance of 78 shellac records and 33 or 45 vinyl records. The 45s are typically 7 inches, but 78s and 33s can be either 10 or 12 inches.

When did 45s replace 78s?

The names are derived from its play speed, 45 rpm (revolutions per minute), and the standard diameter, 7 inches. The 7-inch 45 rpm record was released 31 March 1949, by RCA Victor as a smaller, more durable and higher-fidelity replacement for the 78 rpm shellac discs.