.1 cap

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chad
Junior tube assistant
Posts: 1
(5/30/05 10:07 am)
Reply  .1 cap
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 I'm new here and need to know is the .1 cap running from pin 7,V6 on Doug's ab763 board kit a 630 V. or 250 V. looked through forum but didn't find anything.Almost done & do not want to mess up now. thanks for any info, Chad
 
GroundhogKen
Moderator
Posts: 2793
(5/30/05 10:22 am)
Reply  Re: .1 cap
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 You can always go with a higher voltage cap, but if you are following Doug's parts listing exactly, then that particular cap is the 250V one.

Ken
 
chad
Junior tube assistant
Posts: 2
(5/30/05 10:26 am)
Reply  Re: .1 cap
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 thanks Ken,was not to sure I have 1 of each.Thanks again for the quick reply
 
ampcabinets
Senior tube assistant
Posts: 174
(5/30/05 5:37 pm)
Reply
  Re: .1 cap
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 Hey Ken,
along those lines, does it make a tonal difference changing the 250v cap to a 600v(400v, whatever?), or does it even affect anything?
I always wondered why a 250v cap instead of 400v or 600v like the rest, may be cost savings of a few cents?


thanks,
rob
 
triode3
Junior tube assistant
Posts: 31
(5/30/05 5:53 pm)
Reply  Cap voltage and tone
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 ampcabinets, I have read previously (on some other forums and in person) that some people find that putting a 630V cap in a position where you only have say 100V can cause a tonal change.

From an EE standpoint of view, it should make
no difference what so ever. The voltage rating of the caps is
the maximum voltage that the dielectric between the plates can
hack before it breaks down... or in the case of some film caps,
the max voltage the cap can take before you blow holes in the plates
which will not "self heal"... from an electron flow/physics standpoint,
the rating of the cap should make no difference in tone.

Of course, as we all know, caps made with different materials for
the plates or different materials for the dielectric can in fact sound
different in the same circuit...

My best guess would be "no way", but I would think that if one was
in doubt a good test would be to use two caps, made of the same
material (SBE would be a good choice here as they are available in
all kinds of voltage ratings) with the same capacitance in a low
voltage situation... like say, the tone pot on a guitar. Say a 0.015
on the humbuckers (or a 0.022) rated at 50V, then play for a while,
then change it out with the same one from the same line, but
rated at 600V. I suspect they will sound the same.

As always, just my $0.02, and what do I know?
 
ampcabinets
Senior tube assistant
Posts: 177
(5/30/05 6:07 pm)
Reply
  Re: Cap voltage and tone
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 Hey.. mr triode, I listen to every one on this forum, bar none.
your stats say a whole lot to me.
I take it all as , some people have already tried these things and know first hand, others know their theory pretty derned well. There is always someone better than me, and I know how to listen, and am willing to try different things.
I am always willing to listen and learn.
Your .02 is worth 1.00 to me.
rob
 
 
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