Re: Good capacitors

On 7 Mar 2006 22:09:03 -0800, "Matty-t" <matthews@xxxxxxxxxxxxxxxxx>
wrote:

"Well, maybe not, but $10,000 power chords have done a lot for rock
and roll musicians."

Like who? Unless I am missing a joke or pun?

---
Yes, you are. The thing you were talking about was a power _cord_.

A power _chord_ is something entirely different.
---


"And this "signal injector" is what, specifically? "

I don't disclose information about my test suite. But I will tell you
it was written by Moi. It runs with a computer driven 4 channel scope
scope interface and a secondary communication device for output as
well. It is capable of outright bashing an amp to the outer regions of
the universe while giving me distortion @/vs slew, THD, TIM, etc.. it's
funky stuff... And admittedly way more then I need. But it gave me a
chance to test the limits of my coding abilities. We all know spelling
isn't my strong point ;)

---
Not wanting to disclose information about your "test suite" may
indicate that your technical capabilities may also be weaker than
you'd like to disclose.
---


"Not true.

Loudspeakers and room acoustics have a lot to do with it, as do the
ears and brain (or lack of) of the listener.
"

A very true statement, but we are not on the same page and that is my
fault. When I made the "sound" satement I made it *after* admitting my
only ears were a scope and injector. I was not referring to an actualy
listening situation where so many other varibles obviously come into
play.

"Oh, so true, but then they go and spoil it all by putting those
nasty old tone controls and equalizers on them... "

Now we come to a bridge. I am afraid I must generalize this becase I
cannot sit here all nite and type. Actually I believe tone control has
it's place. But it's not built into an amplifier. And there are a lot
of reasons why I think this is just plain retarded in general.

When an amplifiers sole duty is to amplify without coloration why the
hell would you put a bunch of goodies on it in *order* to colorize it?
Even if you set it all flat those components don't dissapear from the
signal path and the damage is already done.

---
Depends. If they're far enough upstream that they don't add any
perceptible noise and flat is flat, then they'll be transparent and
no damage will be done. The reason they're put there is because
some folks don't _want_ to buy a separate equalizer and they're
happy with what comes on the amp.
---

the user to select thier sound coloration device of choice. You sould
not be forced to accept you amplifier manufacturers 'ideal' methods of
doing so.

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You don't like it? Don't buy it.
---

If I had my way I would march into every amplifier manufacturers
building, march straight up to the head engineers office, and scream in
his face "Just make the fucking signal bigger and don't fuck it up!!"

---
Yeah, that'll do the trick...
---

But we don't live in a perfect world.


"What requirements are you talking about?"

The simple answer is "consult your equiptment service manual"


"What do you mean by "true to it's" (its?) "values"? "

I mean they make a reliable cap with good QC and I have not seen an
example off the shelf outside specs yet. Do they exist? They have to as
no process is infailable. But I have good experience with using these
caps as far as "being what they claim to be out of the box"


"Don't just try, when replacing filter caps, _always_ replace with a
cap rated for a voltage _at least_ as high as the voltage rating of
the cap being replaced."

Withing voltage specs *means* at least the originol voltage.

---
But "try" implies that if you can't get at least the spec'd voltage,
lower will be OK.
---

I'm sorry if anyone construed that differently.

OK. :-)
--
John Fields
Professional Circuit Designer
.