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As I understand it, line filter caps are there to filter out interference from the AC line. Perhaps those were more important years ago, when cars had magnetos, etc.
The 721 has a few other caps with high voltage ratings. The oddball that I recall is a mica around the horizontal adjusters, 5 pf/1.5KV, which I replaced with some ceramics in series. Not my usual style, but that's all I had on hand, and it's holding up fine, so far.
Phil Nelson
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