Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83 based; site hound.UUCP Path: utzoo!watmath!clyde!burl!hou3c!hocda!houxm!hound!rfg From: rfg@hound.UUCP (R.GRANTGES) Newsgroups: net.audio Subject: Re: Record speeds Message-ID: <636@hound.UUCP> Date: Tue, 25-Sep-84 23:52:13 EDT Article-I.D.: hound.636 Posted: Tue Sep 25 23:52:13 1984 Date-Received: Thu, 27-Sep-84 04:28:46 EDT References: <13812@lanl-a.UUCP> Organization: AT&T Bell Labs, Holmdel NJ Lines: 12 [.] I don't think anyone is now alive, certainly not on the net, who remembers exactly why those particular speeds. The rationale for around 78 rpm makes sense but doesn't convince. In the good old days when 78 rpm was standard, the commercial or professional standard was 33 1/3 rpm with transcriptions made on 16 inch (if I remember right) discs. You could record a 30 minute radio program on one side that way, I recall, which may have had something to do with the choice. When LP records came along (also called "microgroove records") the grooves were smaller and you could get 30 minutes on a 12 " record at 33 1/3. RCA came out with 45 rpm just to be difficult. -Dick Grantges hound!rfg