But it gave you an excuse to teach us about the wonders of old school tech!<br><br>By the way, the flyback transformer solved three problems that plagued the earliest TV designs:<br>1) a separate high voltage power supply, which would have been very dangerous at power line frequency (50 or 60 Hz), and expensive;<br>2) if the horizontal and vertical sweep oscillators both failed, while the high voltage power supply continued to run, the electron beam would quickly burn a permanent dark spot in the phosphor coating of the tube;<br>3) and the energy released by the horizontal sweep oscillator had to go somewhere.<br><br>All three problems were solved with one design by having a many-turns secondary winding on the flyback transformer feed a high voltage rectifier and filter to provide high voltage to the CRT.  Running at a high frequency makes the power supply smaller, lighter, and cheaper; the skin effect at 15-16 KHz makes the current less dangerous; and horizontal sweep failure makes the high voltage fail, so the beam can't burn the screen!