http://netvouz.com/url/e8936ffdb678b02a3e5728fb9b46cdb4?feed=rss Info about a link http://www.john-a-harper.com/tubes201/ Online article explaining the physical and electrical operation of vacuum tubes. Contains some mathematical equations, but they are only supplemental. electronics toddmarco Mon, 12 May 2008 01:17:50 GMT