> Isn't a 630V 1uF "milspec" poly cap somewhat ... large?  Say,
> close to transformer sized?

A 1uF 250V X2-rated cap is 31 x 24 x 14mm, about 1/2 the size
of a small mains Tx. And a lot more common than Tx's in gear
available for parts-stripping (eg PSUs) by the frugally-inclined

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