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No Micas in my tuner or IF circuits. Have you actually used the NP0's in place of Micas in your TVs?
Appears that Micas were the only cap available that could maintain stability at high voltage ratings - paper capacitors at the same rating would've been prohibitively large and not as stable in value at that rating. Sounds like they just didn't have the technology that made an alternative practical decades ago.
Looks like Vishay-Ceramite and Kemet make w ceramic with a C0G or NP0 substrate at smaller values, although I'm looking for higher than a KV rating (10pF 1.5kv for a Damper section), Mouser only has a 6KV version in stock. I hope using a cap 400% over spec won't produce it's own problems.
As far as the higher values like 4700 or 3900pF, those are fairly abundant at the high voltage ratings, such as the Wimas or Kemets.
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