On Apr 26, 12:17 pm, "Iain Churches" <Iai...@[EMAIL PROTECTED]
> wrote:
> I wonder what the DC resistance of a 250mA fuse might
> be?
>
> I have just been speaking with a guy would told me that he
> has replaced the fuse from the CT of the OPT of his tube
> amp with a wire link, "because the fuse adds to the power
> supply impedance and does not have a linear response"
>
> He could not quote any reference to substantiate this.
>
> I wonder what the audio bandwidth impedance of a
> 250mA fuse might be? -)
>
> Compared to the cost of an OPT, the fuse seems to be a
> good component for such a small investment.
>
> Iain
You friend is right. A fuse is a terrible waste of wire. There is no
gain on it. Anything that isn't straight wire with gain kills the
sound. Active devices are worst -- that's tubes to you newbies.
Capacitors are next, assassins of your sound. Then resistors which
have 31 different kinds of noise, including the polite "Johnson noise"
for those who want to avoid explicit ***ual references. Inductors
might be marginally acceptable if wound with silver wire on Black
Mountain ferrous cores but generally speaking bent wire (you can't
make an inductor with straight wire) is awful, which is why, as is
widely known, transformers wreck the sound so much that some people
put up with transistors just to avoid transformers. So, there is
nothing left except straight wire with gain, if you want really fine
sound. Of course, the finest sound is silence, and that is what you
get with straight wire, since no one knows how to give gain to
straight wire. As I said, your friend only sounds weird: in an
engineering and audiophile sense, he is perfectly right. All truly
advanced audiophiles arrive at straight wire and listen raptly to the
silence.
Andre Jute
Visit Jute on Amps at http://members.lycos.co.uk/fiultra/
"wonderfully well written and reasoned information
for the tube audio constructor"
John Broskie TubeCAD & GlassWare
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containing vital gems of wisdom"
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