New Vista/Philco

[DaveWM]

Good to know, thanks for the input.

[old_tv_nut]

Second on checking the HO current. Agree it's a common cause of overheating the flyback and more likely to kill it quickly than any other cause.

Horizontal circuits are designed very close to actual planned usage due to the difficulty of handling high currents and voltages. Flyback transformers are a balancing act between staying within the safe limits of the horizontal output device, producing the desired output, having suitable fire-retardant properties (which affects the dielectric constant, distributed capacitance, and dissipation factor of the winding), etc. etc.