{"id":6335,"date":"2020-12-13T21:40:51","date_gmt":"2020-12-13T19:40:51","guid":{"rendered":"http:\/\/www.tonmeister.ca\/wordpress\/?p=6335"},"modified":"2025-03-17T09:41:57","modified_gmt":"2025-03-17T07:41:57","slug":"turntables-and-vinyl-part-5","status":"publish","type":"post","link":"http:\/\/www.tonmeister.ca\/wordpress\/2020\/12\/13\/turntables-and-vinyl-part-5\/","title":{"rendered":"Turntables and Vinyl: Part 5"},"content":{"rendered":"\n

Back to Part 4<\/a><\/p>\n\n\n\n

Before we go any further, we need to just collect a bunch of information about vinyl records.<\/p>\n\n\n\n

General Information<\/strong><\/p>\n\n\n\n

Min groove depth: 0.001″ = 0.0254 mm = 25.4 \u00b5m
Max groove depth: 0.005″ = 0.127 mm = 127 \u00b5m<\/p>\n\n\n\n

12″ LP’s<\/strong><\/p>\n\n\n\n

Outside modulation groove radius: 146 mm
Inside modulation groove radius: 60 mm
Total maximum modulation radius: 86 mm (3.4″)
Typical modulation radius: 76 mm (3″)<\/p>\n\n\n\n

7″ 45 RPM<\/strong><\/p>\n\n\n\n

Outside modulation groove radius: 84 mm
Inside modulation groove radius: 54 mm
Total maximum modulation radius: 30 mm (1.2″)<\/p>\n\n\n\n

Basic math<\/strong><\/p>\n\n\n\n

Pitch = (Running time x RPM) \/ Modulation Radius<\/p>\n\n\n\n

Groove Width = (1000\/LPI + 1) \/ 2<\/p>\n\n\n\n

Peak Amplitude of Displacement = Peak Lateral Velocity \/ (2 \u03c0 freq)<\/p>\n\n\n\n

Examples<\/h2>\n\n\n\n

Pitch = (Running time x RPM) \/ Modulation Radius
Pitch = (20 minutes x 33.333) \/ 76 mm
Pitch = 8.8 lines per mm (LPm) = 223 LPI<\/p>\n\n\n\n

Groove Width = (1000\/LPI + 1) \/ 2
Groove Width = (1000\/223 + 1) \/ 2
Groove Width = 2.74 mil = 2.74 x 10^-3 inches =\u00a0 0.0696 mm<\/p>\n\n\n\n

Peak Amplitude of Displacement = Peak Lateral Velocity \/ (2 \u03c0 freq)
Peak Amplitude of Displacement = 70 mm\/sec \/ (2 \u03c0 1000)
Peak Amplitude of Displacement = 0.011 mm<\/p>\n\n\n\n

Reference:
<\/strong>“Basic Disc Mastering” by Larry Boden (1981)<\/p>\n\n\n\n

On to Part 6<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Back to Part 4 Before we go any further, we need to just collect a bunch of information about vinyl records. General Information Min groove depth: 0.001″ = 0.0254 mm = 25.4 \u00b5mMax groove depth: 0.005″ = 0.127 mm = 127 \u00b5m 12″ LP’s Outside modulation groove radius: 146 mmInside modulation groove radius: 60 mmTotal […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[66,4,6],"tags":[],"class_list":["post-6335","post","type-post","status-publish","format-standard","hentry","category-analogue","category-audio","category-recordings"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p48hIM-1Eb","_links":{"self":[{"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts\/6335","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/comments?post=6335"}],"version-history":[{"count":8,"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts\/6335\/revisions"}],"predecessor-version":[{"id":8407,"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/posts\/6335\/revisions\/8407"}],"wp:attachment":[{"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/media?parent=6335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/categories?post=6335"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.tonmeister.ca\/wordpress\/wp-json\/wp\/v2\/tags?post=6335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}