[Audio Empire]

On Sat, 5 Mar 2011 08:33:54 -0800, Arny Krueger wrote
(in article ):

A high gain stage might call for 33,000 Ohm resistor. OK,
fine. I'll use a 33,000 Ohm resistor. But if I choose a
carbon composition resistor instead of a metal film, that
high gain stage will be noisy.

You're joking, right? Nobody is using carbon composition resistors these
days.

No, I'm not joking. I was using an extreme case to make a point, and that
SHOULD be obvious to even the most casual observer. Of course, nobody uses
carbon comp resistors any more, but if one did use them throughout an amp
design, that amp would sound different from one using metal film resistors.

Same
thing with capacitor selection. If my design called for a
a series of coupling capacitors capacitor in the signal
path and I used tantalum capacitors in those spots
instead of a some kind of low DA film capacitor like a
polypropylene or a mylar film capacitor, the amp circuit
is going to sound different than it would had I used the
low DA types of capacitors.

Same story. I even had a well-known capacitor dielectric maven whose named
rhymed with bung send me some good and bad capacitors to try in some
projects. The so-called bad capacitors were simply not the part that long
accepted wisdom said should be used in the application. The good capacitors
were film capacitors but in actual use there was no measuable or audible
benefit as compared again to what long accepted wisdom said should be used.

IOW, Walt sent you some tantalums (or maybe some aluminum) electrolytics and
some Polypropylenes? Tantalums shouldn't be used in audio circuits for a
number of reasons, and you are right, the wisdom not use them is well known
and long established, and I know that. But again, this is an extreme example
to show that component type and quality can change the quality of an
otherwise decent design.

DA is important in sample-and-hold circuits and afew other applications. The
fallacies associated with audio enthusiast misunderstandings of DA have been
explained well by well-known and highly regarded experts such as Robert
Pease of National Semiconductor.

I know that he disagrees with Mr. Jung et al on this issue, but blind tests
between two Hafler preamp kits, many years ago, one wired per the factory,
and the other wired with "Wondercaps" in place of the factory supplied
capacitors, showed conclusively that the "Wondercap" wired Hafler sounded
much cleaner than the one wired with the factory caps. That and an experience
where I replaced the Mylar film caps with "Wondercaps" in my Magnaplanar
Tympani 3Cs (the ones with the eight panels) showed me conclusively (as far
as I'm concerned) that Jung was correct about capacitor sound.