Richard Lamb wrote:

Trick question, Old Kevin?

How many grooves are on a 45?


Not sure what the trick is- one per side just like an LP. If you mean
what is the pitch, it varies. The leadscrew servo speed is controlled by
the signal from the preview head on the tape deck- if the music is
louder, the deviation is greater and the groove pitch is wider.

Kevin Gallimore


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