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The circuit I posted might be able to give you 10V P-P if you use 24V as your supply. Transistors like 2N2222 and 2N2907 are rated at 40V and should do the job.
What is wrong with the existing sync separator that you need an outboard one?
The green shading, if it is not a purity setup problem, could be inadequate decoupling in a video circuit getting crosstalk from a sweep circuit due to a weak cap.
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