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Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

RE: 78 rpm stylus for 33 rpm records? Can it hurt?

> What we think of as a "modern" microgroove 33 1/3 RPM Lp started after WW2 and at first
> had a 1 mil groove. About the time stereo came out the groove width became 0.7 mil.

You are referring to the radial dimensions of conical styli. The groove is V-shaped and does not have dimensions of 1-mil or 0.7-mil. Here is the DIN specification for the V-shaped groove:


The width of the opening at the top of the V on the Hi-Fi News test record appears to be slightly less than 90-microns or about 3.5-mil.

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