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In Reply to: RE: my vote is for the russian silver mica's too..... posted by vinnie2 on February 15, 2017 at 18:28:29
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The Mind has No Firewall~ U.S. Army War College.
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Love the SSGs. Not crazy for the Russian teflon capacitors. If I had to use an adjective to describe what I don't like so much, it would be "hard", but just a little. I only wish the SSGs were available at least up to 0.22uF. Otherwise, these days I like VCap CuTf. Quite a leap in cost from SSGs, unfortunately.
I have found the SSG's work at lower values than you would think. Try them and you may be pleasantly surprised. Let your ears tell you if they are working. I have used them on several occasions where 0.22 was called for as a coupling cap with good results.
I think your description of the teflon caps is accurate from what I have heard. I bought quite a few of them years ago, but I just don't ever seem to choose them over the SSG's when voicing my creations. Going to sell them pretty soon and by more SSG's while I can I think.
Edits: 02/16/17 02/16/17 02/16/17
I am not sure what you mean. Do you mean to say that where the circuit may call for 0.22uF, one could get away with a lower value of SSG and achieve the same cut-off (in the case of a coupling capacitor)? I always assume that you cannot fool with the math. Microfarads is microfarads.
That's what I used to think until I did some experimenting. I have always maintained that the numbers don't always tell the whole story, and I would rather trust my ears. As long as you use the proper voltage rating you won't hurt a thing by trying smaller microfarad values for the SSG's. Give it a try, you might be pleasantly surprised. I know I was.
Edits: 02/17/17
Of course you won't hurt anything, but inevitably you are changing the -3db point. Whether you can hear the difference or not is quite another subjective issue. However, the difference is there for sure. Once in a while, I have found it possible to get away with a lower value coupling capacitor where it is also possible to double the value of the resistor that goes to ground, in a coupling mode. In THAT case, you don't change the -3db point. IOW, 0.22uF with a 500K resister is ~equal to 0.1uF with a 1M resistor, in terms of the -3db point.
nt
I did allow that you might not readily hear the difference between a 2 Hz cut-off frequency in the bass and a 4-Hz cut-off, assuming you replaced a 0.22uF capacitor that was giving you the low cut-off point with an 0.1uF value. I am only insisting on the math, that one shouldn't kid oneself with the idea that, because you do not hear a difference, there IS no difference.
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