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    Caps PIO K40Y-9 and K42Y-2

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    Pillo69

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    Caps PIO K40Y-9 and K42Y-2

    Post by Pillo69 on Sun Sep 03, 2017 5:26 pm

    What is the difference between the K40Y-9 (silver) and K42Y-2 (green) models of the PIO caps ?.
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    arledgsc

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    Re: Caps PIO K40Y-9 and K42Y-2

    Post by arledgsc on Tue Sep 05, 2017 9:59 am

    Try this for more information...  But garbage in/ garbage out sometimes.  

    http://audiokarma.org/forums/index.php?threads/russian-k40y-9-pio-vs-k42y-2-caps-any-difference.530385/
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    Pillo69

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    Re: Caps PIO K40Y-9 and K42Y-2

    Post by Pillo69 on Tue Sep 05, 2017 7:05 pm

    Thank you.
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    corndog71

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    Re: Caps PIO K40Y-9 and K42Y-2

    Post by corndog71 on Tue Sep 05, 2017 7:29 pm

    I've used both and haven't noticed a difference in sound quality. They're both remarkably balanced with plenty of detail. Perhaps a touch on the warm side.
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    Peter W.

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    Re: Caps PIO K40Y-9 and K42Y-2

    Post by Peter W. on Wed Sep 06, 2017 1:11 pm

    Pillo69 wrote:What is the difference between the K40Y-9 (silver) and K42Y-2 (green) models of the PIO caps ?.

    Primarily it is how the metallic material is applied. One uses actual metal film, one uses a metalized film. In practice, do a blind comparison to a conventional film cap of good quality and screened for value. I will state that well made capacitors from reliable manufacturers screened for value using a reliable cap-checker and used within design parameters will be pretty much indistinguishable one from another.

    On the other hand, bragging rights have value to some - no small thing.
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    Bob Latino
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    Re: Caps PIO K40Y-9 and K42Y-2

    Post by Bob Latino on Thu Sep 07, 2017 6:47 pm

    corndog71 wrote:I've used both and haven't noticed a difference in sound quality.  They're both remarkably balanced with plenty of detail.  Perhaps a touch on the warm side.

    What Corndog has written here is exactly what I have noticed with the K40-Y and the K42-Y caps. There is very little (if any) difference between these two capacitors at least if used as main coupling capacitors in a tube amp. Both are slightly on the warm side and both give a very wide and deep "3D type" soundstage. If you buy them on Ebay, K40 caps tend to be a little more expensive than the K42's but that does not mean that they are "better". K42 caps also tend to be somewhat smaller in size than their K40 counterparts with the capacitance and voltage ratings being the same. This makes a K42 easier to fit into some situations that have limited space.

    Bob
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    Pillo69

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    Re: Caps PIO K40Y-9 and K42Y-2

    Post by Pillo69 on Thu Sep 07, 2017 7:50 pm

    Thanks for the answers.
    The main reason is the space (as commented Bob), if the price is lower (k42) also helps.
    It is good that the performance of the two models is similar.

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