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Here is a short summary I copied from somewhere:
K31, SSG, SGM, KSO - mica, some types with silver - good
K40 - PIO - Paper in oil
MBGxx, KBG-xx, OMBG - PIO
K42, MBM, BM-x - paper (w/o oil ??)
K70, K71 - Polystyren ("polystirol") - good
K72, FT - teflon ("ftoroplast") -
K73 - Polythelene Teraphthalate film ("lavsan") - poor
K75 - combined Paper+Film (Polythelene Teraphthalate??, with or w/o oil??)
K76 - Laquer film
K78 - Polypropilen
It doesn't matter how you stir
the pot, Bullshit in always equals Bullshit out!!
Follow Ups:
For your regret, Soviet and Russian radio components is not a very good sound quality.
If, of course, keep in mind the highest level of sound.
For PP amplifiers, they may come. But I personally interesting only the highest level of sound. I, russian man, therefore do not apply Soviet, and the more any Russian components.
For example, all mica capacitors require a large operating voltage (for polarization). A "top" mica capacitors SGG, possess nonlinear impedance at high frequencies. On the other capacitors, I better not tell you. )
The Soviet capacitors made for war, basically. Sound has other requirements. More for home appliances - these very poor quality. Modern Russian capacitors generally super very poor quality ... even not for war ... China better.
The old Soviet era tubes such as the 6n6p, 6n1p-ev, 6h30p, 6s45p-ev, 6p14p-ev, 6p3s-ev, gu50, and gm70 were built for war, which makes them tough as nails, but they sound great as well. A heck of a lot better than the Chinese tubes I've heard, from both a sound and reliability standpoint.
On the other capacitors you say "I better not tell you". I wish you would, as your viewpoint would be very interesting. As far as the caps go, well I haven't heard many Chinese capacitors, would you please suggest some that we may try? If they are better than the Soviet era caps, I'd love to hear them. As it is, I've compared the Soviet caps with many US and European caps, and I think some of them, in the right application, are very good.
A 4uf 600V Vcap in a parafeed application would be ridiculously expensive, so haven't tried them there, but the Russian KBGs have beat the other paper and oils, and plastic caps I've tried. The teflon Ft3s I've compared with the RFT Exotica teflons and are at least 95% as good at 1/10 the cost. I think with a little modification with damping and leads, they might be just as good if not better.
I have noticed that the 1970s and older Soviet tubes seem to be better than later production. I have not been impressed with modern Russian Sovtek and EH tubes, and haven't even seen modern Russian capacitors for sale at all.
Kind of ironic to have a guy from the U.S. defending the quality of Soviet components to a Russian citizen!8^D
twystd
The K40Y9's sound very good and are small and cheap. With Vitamin Q Spragues becoming more unobtainable every day, the K40Y9's are a wonderful cap for our future.
The Russian FT-3 0.10uf 600V cap is a little bit of audio magic. At first these can sound distorted and problematical. They disappear sonically after about 25-35 hours.
They are simply the most dynamic cap I have ever used. More importantly, the highs are simply clean and grainless. I love these things. I cannot say enough good things about these FT-3 caps. I feel they easily surpass the US expensive teflons in terms of dynamics and detail. They certainly exhibit a quieter noise floor.
I have not tried the other caps at this time. I am glad there are those that are testing and evaluating these.
The silver mica's seem to be the flavor of the month at this time. I should try to get a few of the SG variants and see how they compare with the FT-3 caps as a bypass.
Try the Russian MBGOs, in power supplies, and as cathode bypass caps. Try the KBGs as preamp output, Parafeed, and ultrapath caps. Wonder how a .1uf FT-3 bypassed with a .01 SSG silver and mica, or a .1 K40Y and .01 SSG would sound? Going to find out some day.
twystd
I said: modern Russian (Soviet not!) capacitors are very poor. Worst of Chinese cap.
I will tell you a story. Chinese tubes 20 century produced on Soviet documentation. With a low technological level of China quality of the old Chinese tubes were certainly worse than the Soviet tubes.
I know perfectly sound all without exception Soviet tubes. Therefore, your approval gives me a natural question. As for you high-quality sound?
Of the Soviet (the Soviet period, not Russian) is literally five tubes with a decent sound. More ... ??? No!
Vlad
I agree with you that modern chinese caps and tubes other than some of the Shuguangs are mostly crap..Im sure the Tin Jin may be ok but what Twysted and I are talking about are the Russian military capacitors.
" I said: modern Russian (Soviet not!) capacitors are very poor"
What is a modern Russian capacitor? I don't know that anyone here uses them. Also you made a statement 3 weeks back that we were all more or less foolish to buy Russian caps when you feel jensen is better,take it from a guy from Russia who knows.Not everyone can afford Jensens and some have suffered reliability issues from my understanding on the higher priced caps.
Now you say you were referring only to modern Russian capacitors.Again,
please tell me what is a modern russian capacitor.
One more thing..I hope you stocked up on enough vintage american and british tubes because if the supply ever depletes,you won't have any tubes to buy being you don't like Russian and chinese tubes.
It doesn't matter how you stir
the pot, Bullshit in always equals Bullshit out!!
I have already several times saying the same thing. The Soviet capacitors are not for use in high-quality sound equipment! Russian capacitors, ie capacitors modern times worse than the Soviet. So it is understandable?
I do amplifiers exclusively for themselves. I do not manufacturer. I am a physicist. With nearly forty years of experience in the tubes. Therefore, in my century European tubes enough)))) Repeat what valves?
I've seen that list and then others, and there is always small conflicts. One conflict that I know of, is the definition of PIO. In some Russian wholesale supplier catalogs I've seen, PIO is used to describe both paper and oil and polypropylene in oil. I guess the only way to find out for sure is to cut them up and see what's in there. I've emailed Gintaras of kwtubes, he says the MBGO types are metalized paper and some unknown waxy type substance. I suspect that the KBGs are true PIOs as we know them, because of their size is so much bigger that the MBGOs for equivalent uf/v ratings.
I hate to sacrifice some of my big Russians in the name of "science". I'm also a little worried of what may be in them. I know the Russians weren't too environmentally concerned, and I imagine the safety of the workers probably wasn't their first priority either.
twystd
Sir dealers!
I download the promised photos of Soviet capacitors, which can not be applied in Hi-End sound equipment:
[URL=http://keep4u.ru/full/080501/533873a6ca48d2e11b/jpg][IMG]http://keep4u.ru/imgs/s/080501/53/533873a6ca48d2e11b.jpg[/IMG][/URL]
The black cylinder located above the capasitor K40u-9, it is the "undressed" capasitor K40u-9, with the purpose of an opportunity of improvement of a sound. Unfortunately, the sound of this does not become Hi-End ...
And that does not disappoint you, you open one the greatest mystery of the Soviet secret engineering. By the end of Soviet life in Soviet science and industry made a breakthrough in many areas of knowledge and technology. How, for example, in excess of powerful lasers, nuclear rocket engines, and so on. Here is an example, refer to your interests:
[URL=http://keep4u.ru/full/080501/bb981d8305a796fae8/jpg][IMG]http://keep4u.ru/imgs/s/080501/bb/bb981d8305a796fae8.jpg[/IMG][/URL]
This capacitor - is conducting secret material / ftoroplast special condition. This 1000мкФ = 1000 microFarad, compared with battery size AAA.
Unfortunately, most secrets to the Soviet Union were to lose, as the secrets of famous Third Reich. Because of full loss of reference points and debauch during vague times of disorder of the USSR in the ninetieth years of the twentieth century.
I request you not to extradite anyone my secret story! This is very top secret!!!
BW, VU
Even If I don't agree with your opinion on the Soviet capacitors, I must say you certainly have a good sense of humor!8^)
twystd
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