{"id":19217,"date":"2016-05-29T10:13:24","date_gmt":"2016-05-29T14:13:24","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=19217"},"modified":"2016-05-29T10:13:24","modified_gmt":"2016-05-29T14:13:24","slug":"tubes-and-valves-dans-research-uncovers-three-vintage-films","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2016\/05\/tubes-and-valves-dans-research-uncovers-three-vintage-films\/","title":{"rendered":"Tubes and Valves: Dan’s research uncovers three vintage films"},"content":{"rendered":"

\"Hammarlund-SP-600\"<\/a><\/p>\n

Many thanks to SWLing Post<\/em> contributor, DanH, who writes:<\/p>\n

I have been working on my Hammarlund SP600-JX-21 for the last two weeks. Results of the filter cap replacement were encouraging. I\u2019m going after an AVC issue that is probably capacitor-related as well before doing a re-alignment with the signal generator.<\/em><\/p>\n

All of this activity has turned my attention toward vacuum tubes. I found three vintage industrial films online that caught my interest…<\/em><\/p>\n

The Mullard Radio Valve Company produced The Blackburn Story in 1962. The film was shot at what must have been close the peak of vacuum tube mass production. This presentation is unique in its finely detailed documentation of miniature tube construction. The hand labor required to build some of these tubes is incredible, considering it is a mass production operation. A surprising degree of automation is present for manufacture of some of the more popular tube types. The video resolution is not the best but I found myself ignoring this limitation after the film got underway. I have a few Mullard tubes in my tube boxes.<\/em><\/p>\n