SyncroGuide tannin my hide!

[ctc17]

In every case I have seen there wont be enough voltage to heat the hv rectifier filament long before you loose deflection. (no hv) I would look at the yoke area.
The osc should run close to the right frequency without the feedback. If the fly had shorted turns I dont think you would get any hv.

One other thing that comes to mine is those domino style capacitors. I have seen so many of those fail a week or two after getting an old set working.

Can you post a schematic of the area?

I was just looking at an article in a 50s tv repair mag talking about this deflection. I will try and find it.

[Penthode]

If the stabilisation coil is misadjusted, the horizontal oscillator may double trigger. This makes it appear it is running at a higher frequency.

The simplest check is simply to short out the stabilising coil which a jumper. If the oscillator then runs normally, then the problem is with the adjustment or the 0.01ufd tuning capaitor across it.

Have you tested this?

Terry