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In Reply to: RE: different types of russian caps..... posted by vinnie2 on August 12, 2015 at 10:33:53
If you are using values of the SSG silver micas and/or the teflons that are so low in value as to cut off audible low bass frequencies, they will appear "bright" (obviously). Further, they may appear bright in comparison to the PIOs because they afford a more extended hf response, but that's more a matter of conjecture. I've done no measurements. However, I have compared the K40s to some domestic polystyrene film and foils, in the output of a phono stage, and I far prefer the latter. The K40s sound a bit dull by comparison, although not "bad" in any sense. Too bad also that the Russian teflon capacitors are so physically large for a given value; above 0.1uF, I virtually cannot fit them in to most gear.
Edits: 08/12/15Follow Ups:
Is this what you're talking about? IMO, nothing beats them. They're absolutely the best.
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Buy Chinese. Bury freedom.
Edits: 08/12/15
If that's a Russian teflon capacitor, it's new to me. I guess it could be a teflon capacitor from a non-Russian source. Down below, Tre' says this is a polystyrene, and I must agree that it looks like polystyrenes I have seen. TubeDIY generally avoids this sort of discussion, to my great relief, but I am a big fan of polystyrene capacitors. As I understand it, they are increasingly scarce due to difficulties with making them(?) I have some old 0.22uF/630V PASCAPs, polystyrenes once made in California, they stand up to teflons in similar value any day, IMO. I know polypropylene capacitors get a lot of favorable mention here, but I far prefer teflon or polystyrene film and foil to polypropylene, in coupling applications. End of Tweak-ophilic rant.
You got that right Lew. Good post.
Jeff
Physics is definitely a factor in the observed behavior of various film dielectrics. PTFE has the lowest dielectric absorbtion. Surprise (not), polystyrene exhibits the 2nd lowest dielectric absorbtion. Polypropylene comes in 3rd. Those 3 polymers get good publicity. Polyester exhibits variable behavior, with changing frequency, and draws unfavorable comments.Very much worth repeating is Jim McShane's suggestion to mix dielectric types up and hear the overall circuitry, not the capacitors.
Eli D.
Edits: 08/12/15
Mixing is OK I suppose, but you'll hear the worst of the lot. Same for connecting caps in parallel. A sterling quality cap won't "fix" the sound of a bad one. In the end, the more types you attach in parallel, the better the chances of degrading the amp.
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Buy Chinese. Bury freedom.
+1, Mix em up !!!
Jeff Medwin
I think Jim McShane was recommending using different flavors of capacitor at different points within a circuit, not necessarily paralleling many different types at one juncture, which appears to be the case in your photo. "Not that there's anything wrong with that."
Low Mu sez dis, "one coupling cap in an amp, iz one too many !"Jeff
Edits: 08/13/15
Please?
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
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Have Fun and Enjoy the Music
"Still Working the Problem"
What is it that tells you it is a polystyrerne, so I know what to look for.
The shape of the clear plastic case.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Ouch! I think I passed up a bunch of those cheap at the last hamfest I went to because I did not know what they were. Will watch from now on and see if I can find some to try.
I haven't used those in years, but I recall that they melt and deform rather easily if too much heat is applied to the leads while soldering.
"they melt and deform rather easily if too much heat is applied to the leads"
The leads are very thin, probably for that reason (they don't conduct heat well). I've had zero problems using these.
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Buy Chinese. Bury freedom.
Polystyrene is a great dielectric, but the service temperature is maybe 85 deg C. (Polypropylene is rated to 105 deg C.) Therefore, one should be careful not to mount them very close to tubes or power resistors.
Be careful with silver mica caps of any construction. Thanks to a powerful force called "silver migration" they tend to get leaky with applied DC. Even silver foil caps have problems. They develop fingers that poke through paper or film dielectrics.
Early Jensen silver caps had this problem but they say they fixed it.
I agree the SMs do sound good but check them sometime later for leakage.
I'm a KBG man, myself.
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Free your mind and your ass will follow -- Parliament/Funkadelic
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