Vertical blocking oscillator transformers are a common failure item in 50s and 60s valve TVs due to the fine wire used in their construction.
Replacements are often hard to get.

Here is a way of replacing a transformer with just a few passive components. I've had to do this a few times lately so I thought I'd share this method.

Hey Ian, did you forget to post something or is it a inclusion by Brad pending?

Fred.

The 2nd option!

Photo uploaded.

Suggestion: It is best to include the phrase [photos pending] as MonochromeTV does.

Ian, Aha!

So its a positive feedback loop via the plate to grid to oscillate, and the 15nf tweaks the phase shift?

Fred.

Yes that's basically it.

The 15nF is mainly there to attenuate the hor scan pulses that find their way there via crosstalk in the yoke. If not removed they muck up the interlace.

The whole circuit (not all shown) is fascinating in that the op stage plate provides both positive and negative feedback. It works because of the long time constant blocking that generates the sawtooth waveform by slowly charging and quickly discharging a capacitor.