Ten and a half inch reels, almost always with metal flanges, which fitted over a hub three inches in diameter. These reels and hubs were similar to those used for wider tape formats such as ½", 1" and 2" tape widths, and were principally used for professional and studio applications. The reels were known as NAB reels and the hubs on which they were mounted as NAB hubs.

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  • Ten and a half inch reels, almost always with metal flanges, which fitted over a hub three inches in diameter. These reels and hubs were similar to those used for wider tape formats such as ½", 1" and 2" tape widths, and were principally used for professional and studio applications. The reels were known as NAB reels and the hubs on which they were mounted as NAB hubs. * Reels of up to seven inches in diameter, most commonly with plastic flanges but metal was also used, which fitted over a splined ¼" shaft known as a cine spindle. These reels dominated domestic applications. The most common sizes were seven, five and three inches in diameter. In each case the shaft or hub had three splines. In machines designed to allow for vertical mounting, the upper part of the shaft or hub could commonly be rotated by 60° so the upper splines locked the reel in place. Some tape decks could accommodate either format by using removable hubs for the larger reel size. When in use these hubs were locked onto the cine spindles by the same mechanism used to secure the smaller reels. Reel capacity is affected by both the reel diameter and the reel hub diameter. The standard ten and a half inch reel has approximately twice the capacity of the seven inch reel, which in turn has twice the capacity of the five inch. Some (not all) reels described as three inches are in fact three and a quarter inches in diameter, in order to have half the capacity of a five inch reel.
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  • Ten and a half inch reels, almost always with metal flanges, which fitted over a hub three inches in diameter. These reels and hubs were similar to those used for wider tape formats such as ½", 1" and 2" tape widths, and were principally used for professional and studio applications. The reels were known as NAB reels and the hubs on which they were mounted as NAB hubs.
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  • Audio tape specifications
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