Trying to make a vision IF and Detector - fun!

[ppppenguin]

Tradionally, electrostatic CRTs were run with the cathode at negative EHT. This allows the deflection plates to be directly coupled to the X and Y amps in a 'scope. In a TV you have an alternative - run the cathode at low voltage and AC couple to deflection plates at +ve EHT. Some pre-war TVs did it this way. It may well be easier than AC coupling the video and DC restoring it.