[Tom9589]

Bob Galanter, your tag line (Vacuum tubes are used in Wisconsin to help heat your house) reminded me of a story of when I worked for Scientific-Atlanta in the 70s and 80s. Space heaters were not allowed, but secretaries (yes, they were called secretaries back then) found that you could put a 500 series Tektronix scope in your desk foot well and stay toasty all winter due to its 41 tubes. The only problem is that the scopes were still on the books and still had to be calibrated at the prescribed interval. We engineers made sure the intensity was turned way down so the phosphor on the screen would not get a burned-in pattern. In the late 80s when we cleaned house for a move, the staff got all these scopes. It was my mainstay for years until I got my Tek 475.