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In Reply to: RE: Russian K40y9 input coupling caps - first impressiond posted by KanedaK on February 11, 2017 at 04:28:37
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.
Follow Ups:
I too have used teflon caps in my Marchand XM44 and they were a great improvement over the WIMA's I had in previously. Since then I replaced the teflons with K40Y's and they are head and shoulders over the teflons.
Not all teflon capacitors are created equal. Funnily enough, I tried the K40Ys and found them to be like most other "good" PIO capacitors; they make everything sound "good", but they lose some of the dynamic contrasts that you hear in a live performance. (My opinion, at least.)
Anyway, I doubt that K40Y's would fit in the allotted space where we see those ".22J100" capacitors. Polystyrene film types would also be a good choice. From the photo, it is not obvious to me that the new K40Ys are acting as couplers, but I take the word of the OP for that.
I'm actually satisfied with how it all sounds now - and I want to let these new caps settle in before changing anything else.
But it's true I could later change those small 0,22 caps. What about silver mica?
I read the Dayton Audio DFFC caps are tin foil PP and are dirt cheap. Almost literally dirt cheap. People are raving about them. Tin foil is almost universally respected. A while back when I was looking into tin foil caps this one avoided my radar, assuming it's not brand new. This cap, if it sounds near as good as the much more expensive tin foil caps could spark a revolution. I say try an make them fit somehow. T456
"The Borg is the ultimate user. They're unlike any threat your Federation has ever faced."
- Q, 2365
I'd be looking for a tin foil cap that would fit in the .22 space. Maybe Michael S. can hip you to something that would work. T456
"The Borg is the ultimate user. They're unlike any threat your Federation has ever faced."
- Q, 2365
The caps that are in there now hardly fit. How will any foil cap be made to fit?
berate is 8 and benign is 9
but you may be able to find them in that amorphous plastic casing, as used in many phono RIAA correction circuits. The Russian SSGs are way too large and only available up to 0.13uF/350V. If space is at a premium, the Auricap XO or Dynamicap would almost certainly sound better than the ones you'd replace.
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