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In Reply to: RE: Sorry, my mistake, it only applies to KBG posted by sser2 on April 22, 2017 at 19:24:39
So, the leads aren't welded? It sounds as though the 10V is required in order to overcome contact potential. With or without bias, contact potential has the potential to create sonic coloration and ambiguity.
Then there's this:
KBG capacitor AC component should not exceed:
20% working voltage at 50 Hz
15% 100 Hz
10% 400 Hz
5% 1 KHz
2% 10 KHz
That's a very small margin for an audio coupling cap, particularly in the region of 100 - 400 Hz.
If any of this information is correct, I wouldn't even consider using these in the signal path.
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Buy Chinese. Bury freedom.
Follow Ups:
Yeah you're right, they are total crap, and I'm obviously tone deaf.
twystd
a very cautious approach of Russian component manufacturers.From manufacturer's standpoint, it is very difficult to forsee what kinds of abuse the components will be subjected to by end users, so they have to build in a margin of reliability.
In the US, if components fail at unusual rate, it could be expensive recalls, or a lawsuit at the worst case scenario.
In the USSR, it was accusation of sabotage under Penal Code Article 58, "Anti-Soviet Activities", and sure death in Gulag.
Hence the very cautious approach.
The same data sheet hints though, that under normal use conditions and in non-critical equipment, ratings could be considerably exceeded.
Out of curiosity, I once plugged a 160 VDC-rated Russian capacitor into 220VAC outlet for 24 hours, and nothing happened.
Edits: 04/22/17
"In the USSR, it was accusation of sabotage under Penal Code Article 58, "Anti-Soviet Activities", and sure death in Gulag."
The same was true in China. They still made junk.
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Buy Chinese. Bury freedom.
I've observed that Russian caps and tubes are frequently very conservative in their ratings. I also think that your observation about quality control via the Gulag, explains a lot of the difference between Soviet era and modern Russian tube quality.
twystd
I think USSR manufacturing standards of quality were just as dubious (good and bad) during the Soviet era as they are or may be now. Sure, people were assassinated or sent to Siberia seemingly at random, but not over the issue of blown capacitors. I have many Russian ex-pat scientist friends who are old enough to corroborate this idea. The difference between Soviet and post-Gorbachev Russian goods, if one perceives that quality went down, may be attributable to the decaying economic conditions and of funds to support their military in Russia that led to the dissolution of their empire in the first place. And actually, they are making some good stuff these days. (By the way, one can still be assassinated or sent to prison seemingly at random.)
Actually Lew my comment was somewhat tongue in cheek, and your reasoning sound. I Do believe there was a downturn in Soviet era tube quality during the Gorby years due to other factors as well. Since this is a cap thread and I don't want to hijack it, I'll save that for another post.
twystd
are a case in point. I think that the ones made in the Ulyanov (sp?) factory up to the early 90s are superior, at least more reliable, than ones made since.
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