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Thanks all for the advice and information.
I never gave Mouser or any other parts supplier a thought because I figure someone would have beaten me to it! But you never know. I will grab the part number and Google away...
I shall also follow up with Messrs Dinning and Folsom.
Thank you Jerome. The waveform depicted with the combined parabolas is what I would have anticipated. And the secondary is simply adding a lower coupled parabola to the focus electrode and higher level to the convergence electrodes. And as I thought, the parabolas will modulate the focus to ensure focus can be simultaneously optimized center screen to the screen edge.
The transformer appears simply the means of coupling the 12AU7 to the high voltage focus/convergence electrodes for the vertical parabola only. I remain interested in an electronic substitute eliminating the need for the transformer and will mull over a design.
Meanwhile I shall melt the pitch and see if the old transformer is salvageable. After all it is an open circuit and I may strike lucky if the break is at the winding termination to lead out.
Anyhow I will share what I find with photographs here.
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