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Old 5th December 2010, 04:23 PM   #31
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Late production stage example of the Siemens KS series, and the final S+M version
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Old 5th December 2010, 04:38 PM   #32
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I tried the Russian 100n/250V K71 Polystyrols in RIAA. Shunt Cascode ECC189 architecture.

I did not like them - the bass really suffered, even after long running-in. I put back my ultra-high quality micas (made by TAB) and left them there.

I tried the ССГ micas too, in combination with K71. Still no good.
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Old 5th December 2010, 07:34 PM   #33
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Jaco, my Siemens caps are earlier production than that. I hadn't noticed them before at my local surplus place - maybe they were recent acquisitions for some newly defunct company or someone clearing their stockroom of obsolete material. Anyway, I grabbed a couple of bags. 1n2 is a good value to have for crossover frequencies ~5-6k. I might grab the rest when I go back.
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Old 5th December 2010, 08:11 PM   #34
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Who cares, i have them from late '70s to late '90s production.
Makes no difference to me, these parts virtually last forever, long term stability of polystyrene is top notch and i measure components just the same.
I've awaited superior low-value capacitors since the late '80s, there's been talk about poly-ethylene norbornene caps since the early '90s and still no go, at the current "Out-CD'd" price levels it's a waste not to grab some.
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Old 5th December 2010, 08:13 PM   #35
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Default Expensive, But Nice!

Defibrillator capacitors would be grand, if they were just affordable!
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Old 5th December 2010, 08:21 PM   #36
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Jaco, I don't really care about the date either, it's just noted in passing. The caps I bought were in lots of 50 in their original poly bags - they must have been sitting in someone's stockroom for a while. I paid 30 cents apiece.

Having said that, I've noticed that some of the crummy laid-in lead type polystyrenes tend to craze a bit on the outside as they age, and that's not nice...
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Old 5th December 2010, 08:45 PM   #37
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Quote:
Originally Posted by imfree707 View Post
Defibrillator capacitors would be grand
Ah, i just remember i shack/shag with one of those >1/4m$ medical chicks
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Old 11th December 2010, 07:15 PM   #38
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Siemens KS, I love them

Balanced input all DC coupled RIAA preamp

Regards,
Frans.
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