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As far as I know 45s always used a microgroove cutting stylus. On singles under 3 minutes we cut a 5.5 mil groove although 4 was considered normal. LPs were, of course, packed tighter. Playback styli would be the same as for LPs with the smaller ones being better for stereo because they rode lower in the groove. Bob Olhsson Audio Mastery, Nashville TN Mastering, Audio for Picture, Mix Evaluation and Quality Control Over 40 years making people sound better than they ever imagined! 615.562.4346 http://www.bobolhsson.com http://audiomastery.com -----Original Message----- From: Association for Recorded Sound Discussion List [mailto:[log in to unmask]] On Behalf Of Steven Smolian Sent: Sunday, August 14, 2011 3:28 PM To: [log in to unmask] Subject: [ARSCLIST] 45 groove size Originally 45s were mono, cut with a one mil groove. All vertical signal was noise. At some point (no pun intended- well, maybe) it matched that of the stereo LP, even when the signal was mono, i.e., .5 mils. When did this happen? I'm not discussing EPs, stereo 45s, etc., just your nommal, get the biuck out of the teenager's pocket 45. Steve Smolian