Columbia Records Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.Anti-spam check. Do not fill this in! ==== Outing of "deep groove" ==== By the latter half of 1961, Columbia started using pressing plants with newer equipment. The "deep groove" pressings were made on older pressing machines, where the groove was an artifact of the metal stamper being affixed to a round center "block" to assure the resulting record would be centered. Newer machines used parts with a slightly different geometry, that only left a small "ledge" where the deep groove used to be. This changeover did not happen all at once, as different plants replaced machines at different times, leaving the possibility that both deep groove and ledge varieties could be original pressings. The changeover took place starting in late 1961.<ref>{{cite web|url=http://bsnpubs.com/columbia/columbia12/columbia1600.html |first1=Randy |last1=Watts |first2=Mike |last2=Callahan |first3=David |last3=Edwards |first4=Patrice |last4=Eyries |date=October 28, 2015 |title=Columbia Album Discography, Part 12 (CL 1600-1699/CS 8400β8499) 1961β1962|website=Both Sides Now Publications|access-date=July 2, 2018}}</ref> Summary: Please note that all contributions to Christianpedia may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here. You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see Christianpedia:Copyrights for details). Do not submit copyrighted work without permission! Cancel Editing help (opens in new window) Discuss this page