On Tuesday 29 April 2008 00:53, Jamie wrote:

why not use a isolation xformer for the heaters?

I also read about those, but didn't investigate. It's basically the same idea
as winding an extra turn on the flyback, right? Do you simply place it between
the original filament power supply+gnd and filament? How does it affect image
quality, also taking into account the eventual possible situation that the
blue cathode will be in contact with the heater permanently?