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  1. #1

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    Default Coupling cap question.

    I have a Norh SE-9 tube amp. The input tube coupling caps are .25uF 200V WIMA's (those red square caps). I read over at Audiocircle of someone replacing them with .33uF 450V Auricaps. I really like Auricaps.

    My question is what effect will the extra capacitance have in the circuit? Auricap also make a .22uF 450V but that is a lesser value than the stock. I thought it might be better to go a bit larger. Obviously the voltage rating of the Auricaps is just fine.

    Thoughts, comments, idea's. Having second thoughts going with something that much larger.

    H9

    P.s. I already have the .33uF Auricaps
    Last edited by heiney9; 10-19-2010 at 09:41 PM.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  2. #2

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    The larger cap will mean the low frequency roll off will start slightly lower.If you know the impedance the cap is looking into it 's easy to calculate the change.http://www.muzique.com/schem/filter.htm

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    Default

    Maybe a little more bass?
    Carl

  4. #4

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    More bass but it would be below below audibility assuming high enough input impedance. Using 100k ohms as an example .33uf would result in a corner frequency of 4.8 hz and with .22uf it would be 7.2hz.So both caps would be usable with the example input impedance of 100k.

  5. #5

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    Default

    Thanks guys, I don't have a schematic, but I can post some high rez pics where the caps are. But it sounds like it'll be alright to use a value close but not exact.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

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