[toshiba tony]

I worked for Sony then but never saw one, I can't find the manual but were these grid or cathode modulated? Surely if they were cathode, running the set with each grid drive disconnected in turn would be a good way of finding out where the issue is. I assume the drive circuitry is on the tube base, simply desolder each cathode in turn. But good luck with it, always liked Sony CRT sets but some of the larger sets had purity problems,
Tony Walkr