{"id":687,"date":"2016-11-26T20:56:40","date_gmt":"2016-11-27T02:56:40","guid":{"rendered":"http:\/\/jimlund.org\/blog\/?p=687"},"modified":"2016-11-26T20:56:40","modified_gmt":"2016-11-27T02:56:40","slug":"beckman-db-g-grating-spectrophotometer-teardown","status":"publish","type":"post","link":"https:\/\/jimlund.org\/blog\/?p=687","title":{"rendered":"Beckman DB-G Grating Spectrophotometer teardown"},"content":{"rendered":"<p>Beckman DB-G Grating Spectrophotometer, Cat NO. 1403.<\/p>\n<p>Links: <a href=\"http:\/\/physicsmuseum.uq.edu.au\/grating-spectrophotometer-db-gt\">Grating Spectrophotometer DB GT (1961), University of Queensland Physics Museum<\/a><\/p>\n<p>Bulbs:<br \/>\nE 871 (3 leads, HID, for UV)<br \/>\nGE 2331 (visible, 5.9V, 4.66A, 25W) <\/p>\n<p>photomultiplier RCA IP28A, 69-04 (Anode supply: 1250V. Voltage between dynode No9 and anode: 250V. D-C anode current: 2.5ma. Ambient temperature: 75 Deg C. Package: 1-5\/16&#8243; D x overall length 3-11\/16&#8243; long. Seated height 3-1\/8&#8243; long. base: 11 pin plug-in with socket and 30&#8243; cable. Note: Specification sheet available. Maybe replaced with 931A, average anode characteristics are the same.)<\/p>\n<p>Photomultiplier board:<br \/>\nVacuum tubes:<br \/>\n5654<br \/>\n12BH7A<\/p>\n<p>Main board:<br \/>\nAdams and Westlake Mercury Wetted Contact Relay &#8211; MWSL-15093-1B<br \/>\nVacuum tubes (all filaments lighted):<br \/>\n12BH7a<br \/>\n6973<br \/>\n6EM5<br \/>\n6AX5<br \/>\n85A2\/0G3<br \/>\n12AX7<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Beckman DB-G Grating Spectrophotometer, Cat NO. 1403. Links: Grating Spectrophotometer DB GT (1961), University of Queensland Physics Museum Bulbs: E 871 (3 leads, HID, for UV) GE 2331 (visible, 5.9V, 4.66A, 25W) photomultiplier RCA IP28A, 69-04 (Anode supply: 1250V. Voltage between dynode No9 and anode: 250V. D-C anode current: 2.5ma. Ambient temperature: 75 Deg C. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-687","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/687","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=687"}],"version-history":[{"count":2,"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/687\/revisions"}],"predecessor-version":[{"id":690,"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=\/wp\/v2\/posts\/687\/revisions\/690"}],"wp:attachment":[{"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=687"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=687"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jimlund.org\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=687"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}