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There are various ceramics used. NPO, Z5U etc. They all have different characteristics. Z5U changes capacitance with voltage. It also changes with frequency.
I have no experience using them in horizontal circuits, but I agree with the others that they are likely to be problematic.
If you have film capacitors of the proper values they might work though. I don't think the frequency is high enough to be an issue with them.
John
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