Tape playback speed

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Rendlan

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I've been wondering...

In reel to reel machines: Does the pickup reel revolve at a constant speed? This would mean that the rated speed eg. 15in/s. is an average of the speed attained over the whole reel, right? At the start it would be less than the rating and at the end more, since the diamater of the pickup reel 'increases' as the tape layer becomes thicker, right?

Any ideas?

Regards,

R.
 
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