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Ian Iveson
Guest
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 Posted:
Thu Dec 02, 2004 5:53 pm Post subject:
Re: HTML Catastrophe |
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"Tim Williams" <tmoranwms@charter.net> wrote
| Quote: | I know my share of HTML. I typed my website in Notepad, anyway.
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When you get old, you may find it more difficult to keep the whole
structure in your head clearly enough to make changes a few months
later. That's what makes my head hurt. It would have been much
easier to use a higher level language that documents its own
structure, but I can't be bothered to test for all combinations of
browser, screen resolution, etc.... My interest is in the content
really.
| Quote: | I can do a bit of philosophizing but for the most part, to me it
is old men
arguing in a manner which to the ordinary layman is trancedental
thought but
to one in the know, it is just what it is - arguing, a far cry
from the true
persuit of knowledge which the sciences bring to someone who seeks
it.
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Oh innocent youth!
Thesis, antithesis, synthesis. Is that not how science progresses?
That's the dialectic at work.
"Transcendental" philosophy is an unhelpful category, I fear. It
begs the question of quite what it is transcending, and where it is
transcending to. Earth and heaven perhaps?
In order to accept science as you appear to, then surely for that
decision you stood, for at least an instant, above science as you
mean it. The judgement you made was philosophical, not scientific.
Also not transcendental...it probably felt like a practical kind of
decision.
Alternatively, you were simply mugged and have never woken up.
Can you explain in scientific terms how come Al and Stew are both
right? There is a thesis and antithesis. Can you apply your science
to the obvious opportunity for synthesis in this case, and stop the
argument?
Can you find a new place where everyone can be happy?
And can you explain, in scientific terms, what music is? Or why my
amplifiers are black, green and gold?
cheers, Ian
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Ian Iveson
Guest
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| Posted:
Thu Dec 02, 2004 5:53 pm Post subject:
Re: HTML Catastrophe |
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"RdM" <rdm@orcon.not.zn> wrote
| Quote: | "Where a calculator on the ENIAC is equipped with 18,000 vacuum
tubes and
weighs 30 tons, computers in the future by the year 2000, may
have only
1,000 vacuum tubes and weigh only 1.5 tons"
Popular Mechanics, March 1949
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A prediction based on the assumption that integrated circuits would
be thermionic, presumably!
Engineers still love to extrapolate, but thankfully science these
days knows a bit about revolution.
cheers, Ian |
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John Stewart
Guest
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| Posted:
Thu Dec 02, 2004 6:11 pm Post subject:
Re: HTML Catastrophe |
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Ian Iveson wrote:
| Quote: | "John Stewart" <jh.stewart@sympatico.ca> wrote
(below)
Thanks John! I had planned on doubling up the concertina and using
a ECC83/mosfet mu stage for the input (don't want to tangle with
small pentodes). That would avoid the extra 100V needed to jack up
the second LTP. All in all I like the cascaded LTP better though,
and I happen to have a suitable mains transformer.
I have no spare pins on the umbilical cord for a -ve supply. Is it
better to direct-couple the driver stage to the output stage, rather
than the input to the driver? With parallel output valves it is a
lot simpler to couple with caps.
What do you use as a current source for the second LTP?
cheers, Ian
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Better (And easier) to direct couple the input & driver.
Direct coupling to a PP output stage is rather difficult but could be
done.
Needs some level shifting as you would see in a DC Op Amp.
Either that or the output cathodes need to be biased up.
Occasionally we see SE output stages direct coupled.
In my recent efforts with 2-stage diff amps, both current sources
are simple resistors. I made quite a few measurements of some
relatively exotic arrangements a while back & found that for audio
purposes they provided no significant advantage. You will find some
very neat diff amp circuits in professional measurement equipment.
Let me know if you would like to see an example of a circuit that
has very large common mode rejection.
Most of the distortion in a common audio amp occurs in the output
stage. However, in a PP amp it is important to provide a means of
adjusting the output of the driver to account for imbalance in the
output tubes & imperfect balance in the input stage. That is where
I normally use a pot to set one of the driver anodes while
adjusting for a 2nd harmonic distortion minimum.
In a PP vacuum tube amp there are several ways of arranging the tubes
& output transformer so that various degrees of DF & distortion levels
can be achieved. You have used one somewhat similar to the Quad.
Other examples would be the McIntosh, Circlotron & UL. And the
obvious ordinary PP hookup. In terms of performance vs cost the
best results I've experienced are with the Norman Crowhurst Twin
Coupled Amp which is a version of the McIntosh circuit but uses
two low cost output transformers. You can read about it in the
August issue of AudioXpress magazine.
Cheers, John Stewart |
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Tim Williams
Guest
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| Posted:
Thu Dec 02, 2004 6:12 pm Post subject:
Re: HTML Catastrophe |
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"RdM" <rdm@orcon.not.zn> wrote in message
news:d3etq0pf63ipope86io9dpmc4af7s3f1np@4ax.com...
| Quote: | Philosophising, I'd think, from philosophise. There are rules for "s" and
"z" |
Bah, hesitated on it, thought the Z looked slightly more appropriate.
Oops, slipped one...
D'oh!
:-[ ;)
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms |
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Tim Williams
Guest
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| Posted:
Thu Dec 02, 2004 6:12 pm Post subject:
Re: HTML Catastrophe |
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"Ian Iveson" <IanIveson.home@blueyonder.co.uk> wrote in message
news:FfErd.62093$F7.41879@fe1.news.blueyonder.co.uk...
| Quote: | "Tim Williams" <tmoranwms@charter.net> wrote
I know my share of HTML. I typed my website in Notepad, anyway.
When you get old, you may find it more difficult to keep the whole
structure in your head clearly enough to make changes a few months
later.
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That's why I keep it organized, neatly capitalized and tabbed. ;)
| Quote: | but I can't be bothered to test for all combinations of
browser, screen resolution, etc....
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Meh. I don't use tables, and what pixel indents I use still function at the
lowest resolution nobody uses anymore (640x480). The code checks on
http://www.htmlhelp.com 's validator so I'm not worried about other browsers
(and Greggggggggggggggggggg hasn't bugged me about it, so it must be working
;).
| Quote: | In order to accept science as you appear to, then surely for that
decision you stood, for at least an instant, above science as you
mean it.
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Nah, I grew into science. It's the only persuit that makes sense.
| Quote: | The judgement you made was philosophical, not scientific.
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Didn't say I abandoned philosophy altogether, I have my share of
philosophical thoughts and such... they're just better than the average
philosoph. :^)
| Quote: | Alternatively, you were simply mugged and have never woken up.
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Some would argue that, but I'm too stubborn to even consider it "waking up".
;) Wishy-washy people like that have no absolute truths, seems like a lame
way to live...
| Quote: | Can you explain in scientific terms how come Al and Stew are both
right?
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Absolutely.
It's called a killfile. :D
| Quote: | Can you find a new place where everyone can be happy?
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Nope, too many people are losers and generally unhappy. The USA seems to be
a pretty happy place on the whole, (and other politics, which I am similarly
well versed on but not particularly fond of.)
| Quote: | And can you explain, in scientific terms, what music is?
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Notes! Or not...but we don't call that music. >:)
| Quote: | Or why my amplifiers are black, green and gold?
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Because you have a black soul, green with envy of golden money... :^)
Tim
--
"I've got more trophies than Wayne Gretsky and the Pope combined!"
- Homer Simpson
Website @ http://webpages.charter.net/dawill/tmoranwms |
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