[TinCanAlley]

Originally Posted by vol.2

You could, if that's what you have.

Very low value film caps don't tend to come in high voltage variants, but ceramic capacitors do. Some cap types are chosen for a specific purpose, and can't be changed, but that's not always the case. Ceramics, especially very old ceramics, tend to drift in value with temperature a lot, so they aren't used when the value has to be really specific, but newer ceramics of high stability types will do very well at this point, and can be subbed for films in many places. Maybe not a good idea if it's a tuning cap.

There's a very stable Y5R 680pF cap: https://www.digikey.com/en/products/...P6UK5R/2831053

But I can't comment on the specific place in the circuit that your cap is in. Someone else will have to confirm that 680 is okay, and that the small amount of drift isn't a problem.

Since they're caps in the flyback and horizontal circuits, I thought they might affect the signal and cause ringing. If they don't serve such a purpose, then I'll leave them be.