Fellow SLASers, I took my first electronics course using vacuum tubes. Circuits using vacuum tubes are easier to understand than circuits using transistors for me. The downsides are obvious. Vacuum tubes burn out, generate heat and are bigger than transistors. Sincerely, Gary Vardon The book DO It Right will help you understand vital ideas leading to your geater success. GO to PublishAmerica. -----Original Message----- From: Stephen Peterson Sent: Thursday, August 20, 2009 7:13 PM To: utah-astronomy@mailman.xmission.com Subject: [Utah-astronomy] LRO info Here is a link that LRO fans might find interesting. I always thought the world made a turn for the worse when vacuum tubes went out of favor. http://www.nasa.gov/mission_pages/LRO/news/LRO_twta.html Vacuum tubes are not yet dead! Steve _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com