Hi,
My favorite old TEK 475 Scope has suddenly stopped working. Symptoms are: No trace, screen is blank, intensity and focus control do nothing. Beam Finder shows a dim small circle middle of screen. When power is turned off, circle like BEAM FINDER same size is visble and bright for a breif moment. Panel LEDS are lighted and do respond to switches being changed. Screen graticule cannot be seen.
Any suggestions are welcome. I currently do not have an adequate service manual, just module layout and parts list. I am looking but cannot find the TEKTRONIX scope forum. Thanks for any help. Dave_s