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In Reply to: RE: Are these caps any good? posted by Eli Duttman on April 05, 2014 at 14:24:10
Agreed or paper in oil with a film and foil bypass
Honest amplification is better than excessive 2nd order distortion anytime.
Follow Ups:
I thought it was not possible, but I stand to be corrected.
I hope so because I bought a pair.
DanL
I wonder why they only have a 50 volt rating?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Tre'
The clue is on the site -
"for oil company down-hole circuit boards"
Sounds to me like for heavy duty use.
Built solid and resonance proof.
Good for a speaker crossover to 150Wrms.
DanL
Down-hole oil-company circuit boards have very high temperature requirements, and are one of the toughest specs to meet with solid-state equipment. Teflon has a higher service temperature than most other plastics.
as a piece of teflon adhering to the metal of the pan, you probably CAN metallize teflon. I thought I had read somewhere that metallized teflon capacitors cannot be formed or perhaps they can, if the imposed upper limit is 50V.
There was controversy once around whether Sonicap Platinum caps were akin to metallized teflon.
I have many SC Plats and I can tell you that they are one of the best sounding current production caps there are..If a metalized cap is done correctly with good materials,they can be very good..The SC Plats sound like a paper in oil with a teflon coating and it's a very tastefully done cap and they fit nicely in many vintage amps and preamps.
The Solen Film and foil I like better the SC polys because the Solen's are a true film and tin foil..The SC polys are metalized but they sound decent but the Solens are built very well and are in a class by themselves sonically.
Honest amplification is better than excessive 2nd order distortion anytime.
Interesting. I once had a conversation with the Sonicap guy, wherein he cast some aspersions on V-Caps, intimating they were not "really" teflon film and foil. I believe he also maintained in that same conversation that the Sonicaps, in contrast, WERE true film/foil construction, but it is not fair to hang that latter statement on him, since my memory could be at fault. But I am sure he dissed the V-Caps.
It is good to have your subjective judgements of the relative sonic merits, but in general it seems to me you like PIO caps better than I. So I have to figure that in, too. So far, in my brief experience with K40s, they are indeed well made and reliable, but the jury is very much out on whether I love the sonics or whether the sonics are pretty run of the mill. Just OK. Could be I need more break-in time.
I did some search on metallized teflon, and it seems I was wrong to doubt that such caps can be made. They are fairly easy to find, in fact.
OT, the Russian polystyrenes I found to be underwhelming as coupling caps. I would not use them again. They were not near as good as some US-made polystyrene film and foils I have in my stash, made by a company that is now defunct. ("PAS"?) Also not as good as MIT RTX. Have you tried them (the Russian-made polystyrenes f&f)?
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