{"id":590,"date":"2015-06-21T14:21:05","date_gmt":"2015-06-21T19:21:05","guid":{"rendered":"http:\/\/paulcarbone.com\/blog\/?p=590"},"modified":"2015-06-21T14:21:05","modified_gmt":"2015-06-21T19:21:05","slug":"519-crt-bezel","status":"publish","type":"post","link":"https:\/\/paulcarbone.com\/blog\/519-crt-bezel\/","title":{"rendered":"519 CRT bezel"},"content":{"rendered":"<p>My <a href=\"http:\/\/paulcarbone.com\/blog\/?p=409\">519<\/a> is generally in immaculate condition, however it&#8217;s missing it&#8217;s original bezel.\u00a0 It came with what appears to be a standard 500 series bezel, and some aluminum knurled knobs keeping it loosely attached.<\/p>\n<p>I think there were two versions of the original bezel assembly, one with a camera attachment, one without.\u00a0 Tim Koeth&#8217;s appears to have a the camera attachment (chronicled <a href=\"http:\/\/www.timkoeth.com\/?p=108\">here<\/a>), while the one I saw at Skycraft did not.\u00a0 Check out <a href=\"http:\/\/www.timkoeth.com\/wp-content\/uploads\/2014\/05\/collection.jpg\">this shot<\/a> of his collection &#8211; he just may have me out oscilloscope&#8217;d.\u00a0 Here&#8217;s the shot of the one at Skycraft:<br \/>\n<a href=\"http:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_4019.jpg\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-603\" src=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_4019.jpg\" alt=\"IMG_4019\" width=\"3264\" height=\"2448\" srcset=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_4019.jpg 3264w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_4019-300x225.jpg 300w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_4019-1024x768.jpg 1024w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_4019-400x300.jpg 400w\" sizes=\"(max-width: 3264px) 100vw, 3264px\" \/><\/a><\/p>\n<p>What&#8217;s interesting about this one is that the entries for serial, sensitivity, and risetime appear to be blank.\u00a0 A few things to note about the 519 and it&#8217;s CRT:<\/p>\n<ul>\n<li>There is no vertical amplifier.\u00a0 The signal is passed directly to the distributed vertical deflection plates.<\/li>\n<li>The CRT &amp; shield are typically paired, in part to help protect the CRT.<\/li>\n<li>The vertical sensitivity and risetime is individually characterized for each CRT at the factory, and is marked on the shield and faceplate.\u00a0 They&#8217;re typically on the order of 10v per cm and 350ps, respectively.<\/li>\n<li>The sensitivity and risetime are marked on the backlit faceplate such that it&#8217;s incorporated into photographs, <a href=\"http:\/\/www.timkoeth.com\/wp-content\/uploads\/2014\/06\/TWK_6448.jpeg\">like this<\/a><\/li>\n<li>Because of the extreme speeds that this device operates on, the usable area of the CRT is comparatively tiny; 6cm x 2cm.\u00a0 Compare that with other scopes of the time, which had an active areas of 10cm x 4cm, or 10cm x 6cm.<\/li>\n<\/ul>\n<p>A little more on that last point.\u00a0 In order to capture extremely fast events in real time,\u00a0 you have to sweep the beam across the screen very quickly.\u00a0 The quicker the beam scans across the screen, the less time the beam spends at any given point, and thus the less energy is imparted onto the phosphor.\u00a0 To get enough energy on to the phosphor to make it glow visibly at these speeds requires tremendous accelerating voltages; 24,000 volts(!) in the case of this scope.\u00a0 The trouble is, <em>the more energy an electron beam has, the harder it is to move it around<\/em>.\u00a0 This is why the 519 ended up being a 100 lb beast, with sweep generator is driven by a forced-air cooled RF transmitter tube, a relatively dreadful vertical sensitivity, and a minuscule viewable area.\u00a0\u00a0 Another thing to keep in mind is that while repetitive signals keep sweeping across the CRT face, continuously refreshing the image, this was made to capture single shot events on camera (such as nuclear events), so the beam had to be bright enough to register on film on a single pass lasting less than <em>50 billionths of a second<\/em>.<\/p>\n<p>Back to my scope.\u00a0 Here&#8217;s what it looks like with the bezel removed<br \/>\n<a href=\"http:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3914.jpg\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-596\" src=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3914.jpg\" alt=\"IMG_3914.JPG\" width=\"3000\" height=\"2250\" srcset=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3914.jpg 3000w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3914-300x225.jpg 300w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3914-1024x768.jpg 1024w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3914-400x300.jpg 400w\" sizes=\"(max-width: 3000px) 100vw, 3000px\" \/><\/a><\/p>\n<p>For kicks, I tried installing the graticule from my 551.<br \/>\n<a href=\"http:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3916.jpg\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-598\" src=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3916.jpg\" alt=\"IMG_3916.JPG\" width=\"3000\" height=\"2250\" srcset=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3916.jpg 3000w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3916-300x225.jpg 300w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3916-1024x768.jpg 1024w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3916-400x300.jpg 400w\" sizes=\"(max-width: 3000px) 100vw, 3000px\" \/><\/a><br \/>\nThat&#8217;s not just parallax.\u00a0 The graticule illumination lamps and the notches on the plexi sheet don&#8217;t line up.<br \/>\n<a href=\"http:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3917.jpg\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-595\" src=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3917.jpg\" alt=\"IMG_3917.JPG\" width=\"3000\" height=\"2250\" srcset=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3917.jpg 3000w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3917-300x225.jpg 300w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3917-1024x768.jpg 1024w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3917-400x300.jpg 400w\" sizes=\"(max-width: 3000px) 100vw, 3000px\" \/><\/a><\/p>\n<p>Remember, this was bespoke machine, only loosely based on the 500 series standards of the time.<\/p>\n<p>Upon closer examination of the CRT shield, I noticed mine is sadly lacking the sticker that proclaims the sensitivity and risetime.<br \/>\n<a href=\"http:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3910.jpg\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-591\" src=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3910.jpg\" alt=\"IMG_3910.JPG\" width=\"3000\" height=\"2250\" srcset=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3910.jpg 3000w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3910-300x225.jpg 300w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3910-1024x768.jpg 1024w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/IMG_3910-400x300.jpg 400w\" sizes=\"(max-width: 3000px) 100vw, 3000px\" \/><\/a><br \/>\nOther examples chronicled have a second sticker above this one with hand marked sensitivity &amp; risetime.\u00a0 I really don&#8217;t have the courage to pull the CRT from it&#8217;s shield to hunt for any other markings.<\/p>\n<p>I went ahead and drew up a graticule that should fit:<br \/>\n<a href=\"http:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/tek919-bezel.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-602\" src=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/tek919-bezel.png\" alt=\"tek919 bezel\" width=\"1188\" height=\"1173\" srcset=\"https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/tek919-bezel.png 1188w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/tek919-bezel-300x296.png 300w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/tek919-bezel-1024x1011.png 1024w, https:\/\/paulcarbone.com\/blog\/wp-content\/uploads\/2015\/06\/tek919-bezel-304x300.png 304w\" sizes=\"(max-width: 1188px) 100vw, 1188px\" \/><\/a><\/p>\n<p>This&#8217;ll make it&#8217;s way to the laser next week when I&#8217;m back in town. Stay tuned!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>My 519 is generally in immaculate condition, however it&#8217;s missing it&#8217;s original bezel.\u00a0 It came with what appears to be a standard 500 series bezel, and some aluminum knurled knobs keeping it loosely attached. I think there were two versions &hellip; <a href=\"https:\/\/paulcarbone.com\/blog\/519-crt-bezel\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"table_tags":[],"_links":{"self":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/590"}],"collection":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/comments?post=590"}],"version-history":[{"count":2,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/590\/revisions"}],"predecessor-version":[{"id":628,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/posts\/590\/revisions\/628"}],"wp:attachment":[{"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/media?parent=590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/categories?post=590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/tags?post=590"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/paulcarbone.com\/blog\/wp-json\/wp\/v2\/table_tags?post=590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}