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scole
 Post subject: why 630v .68uf c2
PostPosted: Thu May 14, 2009 5:37 pm 
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why are we using this giant 630v cap when other 18 watt amps just use 50v?
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kurtlives
 Post subject:
PostPosted: Thu May 14, 2009 6:02 pm 
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The commonly used SoZo caps Trinity uses for the V1 cathode is 680nF at 160V. Maybe your thinking of a Mallory or ETR (both yellow), they are rated much higher.

Anyways you dont need a cap rated for much voltage. The preamp tubes cathode voltage is quite low (1V - 4V :roll: ). A 16V cap would work fine.

Why not go over spec though, dosent harm anything.
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coco
 Post subject:
PostPosted: Fri May 15, 2009 11:12 am 
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They dont have to be that large a voltage but this is the way they come from my supplier Sozo & ETR. You can sub a smaller, lower voltage one if you want/can find one.

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scole
 Post subject:
PostPosted: Fri May 15, 2009 1:23 pm 
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so you prefer using plastic caps instead of electrolytic in that position? is it a tone thing?
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coco
 Post subject:
PostPosted: Fri May 15, 2009 5:31 pm 
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scole wrote:
so you prefer using plastic caps instead of electrolytic in that position? is it a tone thing?


Typically, electrolytics go down to 1uf, polyester/polystyrene/mustard/ orange drop etc. go from 1 on down, so it's a supply and of course, that's what's used on most amps I've seen in the low values anyway.

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scole
 Post subject:
PostPosted: Sat May 16, 2009 2:27 pm 
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wouldnt this one be more practical?http://www.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMsCnlYck6hSqFBeLmmtcj8YNmUQu00944k%3d
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coco
 Post subject:
PostPosted: Sun May 17, 2009 9:12 am 
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It would work and we do use 1 uf & 2 uf in the designs.

But 0.68 is correct for that tone/design but you can try lots of values there.

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