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RE: Russian K40y9 input coupling caps - first impressiond

See those beige-colored capacitors marked ".22J100"? Those are 100V/0.22uF. If they are in the signal path (as it appears they are), replace them, too, for another big improvement. I had a few of that type in an electronic crossover. Replacing them with teflon capacitors was one of the most obviously beneficial tweaks I have ever done to anything. Truly night and day. They may be polyester or polycarbonate; not good. At best, they are metallized polypropylene. Polystyrenes are available in small enough size to fit there, and they would be a big upgrade too. (My preference: teflon>polystyrene>polypropylene. Film and foil over metallized film.

By the way, I do think that replacing all the capacitors with K40s would be too much of a good thing. K40s won't fit, anyway.

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