On Wed, 29 Sep 2004 03:15:46 +0100, Kurt Hamster
wrote:

On Wed, 29 Sep 2004 09:04:11 +1000, Tat Chan used
to say...

If the amp introduces artifacts in the output signal, it is a bad amp!

No, it's just an amp that introduces artifacts. If it was originally
designed to do just that and then succeeds in it's mission then it is by
definition a good amp.

If you try to fail, and succeed, which have you done?

An ideal amp is a "wire with gain" ...

Whose definition of "ideal"?

Originally, Peter Walker's, so by extension, anyone with an interest
in 'the closest approach to the original sound', of course!
--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Wed, 29 Sep 2004 15:45:36 +0100, "Keith G"
wrote:

Anybody point me to an amp with ZERO distortion of any kind, then?

Zero audible distortion of any kind? Loads, mate................

--

Stewart Pinkerton | Music is Art - Audio is Engineering

On Wed, 29 Sep 2004 09:00:16 +1000, Tat Chan
wrote:

I refuse to acknowledge the steaming piles of turd that were called
"Episode I" and "Episode II".

Truely, Lucas has lost the plot.

Um, he *wrote* the plot!

--

Stewart Pinkerton | Music is Art - Audio is Engineering

Stewart Pinkerton said:

That Audi of yours has ABS, EBD, ESP, CIA, KGB, CNN, RGB......
What more safety do you need? ;-)

These just let you *approach* the limits of the laws of physics, but I
canna change them, cap'n! In extremis, the A6 will always be an
understeery pig, and I do have a tendency to find myself in extremis
on a fairly regular basis - especially when I've just hopped out of
wifey's TT back into my barge.........

What you need is a BMW rear wheel drive, much more fun to play with.

--
Sander deWaal
"SOA of a KT88? Sufficient."

"Stewart Pinkerton" wrote in message
...
On Wed, 29 Sep 2004 15:52:08 +0100, Nick Gorham
wrote:

Keith G wrote:

Nice try Pinky, but it doesn't work like that - *I* throw the sticks,
*you*
run after them and fetch them OK?

Now, did I (or did I not) see a little mention that you were tempted to
toss
a little triode amp together yourself or was it just another 'brainfart'
of
yours???


(The ****'s bound to go for summat with 845s, with 100W output and about
2500 to 3000V of plate voltage - with a bit of luck he'll slip while
he's
testing it out!! :-)


You would need something a bit bigger than a 845 to take advantage of
3k, 833 maybe...

Not so linear as the 845, and I'm much to old to be *that* bold!


We've noticed........

"Stewart Pinkerton" wrote in message
...
On Wed, 29 Sep 2004 15:45:36 +0100, "Keith G"
wrote:

Anybody point me to an amp with ZERO distortion of any kind, then?

Zero audible distortion of any kind? Loads, mate................



See the word 'audible' anywhere in my post, hmmm? - No, I thought not....

"Stewart Pinkerton" wrote in message
...
On Wed, 29 Sep 2004 15:43:07 +0100, "Keith G"
wrote:

"Stewart Pinkerton" wrote in message
. ..
On Tue, 28 Sep 2004 18:16:19 +0100, Kurt Hamster
wrote:

On Tue, 28 Sep 2004 17:08:20 +0000 (UTC), Stewart Pinkerton used
to say...

On Tue, 28 Sep 2004 15:57:25 +0100, Kurt Hamster
wrote:

On Tue, 28 Sep 2004 13:54:07 +0000 (UTC), Stewart Pinkerton used
m to say...

On Tue, 28 Sep 2004 13:25:55 +0100, Kurt Hamster
wrote:

Surely that depends on your definition of "bad" doesn't it?

It's a simple definition - if what comes out of an amplifier is not a
larger but otherwise identical version of what went in, then it's a
bad amplfier. Not a difficult concept - it's called high fidelity.

And if it was designed that way?

Then the designer designed a bad amplfier. It happens - mostly at very
inflated prices.

No, he designed an amplifier to do a specific job. When will you get
over your arrogance that presupposes that if you think it's bad then
that's what it is?

Nothing to do with me, it's basic definition of what an amplifier
should do - *just* amplify.

To me 'bad' is if it doesn't do the job it is intended for.

A Rover City does the job it was intended for - it's still a bad car!

How can it be bad if it does the job?

It does it very badly - kinda like a 2A3 amplifier............


Nice try Pinky, but it doesn't work like that - *I* throw the sticks,
*you*
run after them and fetch them OK?

Nah, I just like to play with your subspecies for a while, until you
run out of sidesteps. Your little rodent friend claims to be
domesticated, but acts more like a lemming!


'Subspecies' from a hired lackey like you? - That's rich!!



Now, did I (or did I not) see a little mention that you were tempted to
toss
a little triode amp together yourself or was it just another 'brainfart'
of
yours???

(The ****'s bound to go for summat with 845s, with 100W output and about
2500 to 3000V of plate voltage - with a bit of luck he'll slip while he's
testing it out!! :-)

Correct - a push-pull 845 design was *exactly* what I had in mind,
although about 60-70 watts seems a little kinder to the output
devices, and you're clearly not informed about the B+ rail
requirements.


See 833A/TB3-1000 75W/100W A2 class monotriode on...

http://www.recherche.enac.fr/~puechmor/e_projets.html

....it uses 211s or 845s as fekkin' drivers....!! :-)


Make your hair curl if you get careless though.....


More like a *very* memorable scene in The Green Mile, I suspect! ;-)


The point was, after all, to prove that even a simple valve design
*can* be made linear if you know what you're doing! Essentially, a
Nagra amp at asensible price. It will of course sound just like my
Krell, or my Audiolab 8000P, or a Yamaha AX-592, but that's not a bad
thing, just an extravagance.


Anyway, cut all the blather and bluster - *do* something for once! Let's see
*you* throw an amp together - I've done it...

http://www.apah69.dsl.pipex.com/keit...de_project.htm

....and my dog knows more about 'electronics' than I do....

(It ain't rocket science.....!!!)

Kurt Hamster wrote:
On Tue, 28 Sep 2004 22:41:18 +0100, Ian Molton used
to say...


On Tue, 28 Sep 2004 18:16:19 +0100
Kurt Hamster wrote:


So why does every amplifier on the planet do more than just make the
sound louder?

None of mine do - at least within the AF band...


Just 'cos you can't hear it doesn't mean it isn't doing it.

If its beyond my ability to hear it (and any harmonics / intermodulation
caused by it) then I really dont care.

Keith G wrote:
"Tat Chan" wrote in message
...

Kurt Hamster wrote:


On Wed, 29 Sep 2004 09:04:11 +1000, Tat Chan used
to say...


Amplifiers are meant to produce a larger version of the input signal.


Certain amplifiers are. If they have tone controls on them then they
aren't "meant" to just amplify n'est pas?

if they have tone controls that means the user can adjust the frequency
response of the amp. That would be a "feature", it still does not detract
from the basic task of an amp.


If the amp introduces artifacts in the output signal, it is a bad amp!

No, it's just an amp that introduces artifacts. If it was originally
designed to do just that and then succeeds in it's mission then it is by
definition a good amp.


I won't call it an amp then. "Signal processor" maybe?



Anybody point me to an amp with ZERO distortion of any kind, then?

I'm sure for most amps will have zero distortion for a very limited
frequency range and a "small enough" input signal. I haven't looked a
frequency response graphs in a while.

My amp has THD figures of "less than 0.07%" and a "flat" frequency
response from 20 - 20kHz of plus/minus 0.5dB.

Stewart Pinkerton wrote:

On Wed, 29 Sep 2004 09:00:16 +1000, Tat Chan
wrote:


I refuse to acknowledge the steaming piles of turd that were called
"Episode I" and "Episode II".

Truely, Lucas has lost the plot.


Um, he *wrote* the plot!


and that is why! Episode V was written by Leigh Brackett and Lawrence
Kasdan. And it was the best of the lot ...

(anyway, notice how bad the new movies are compared to the classic
trilogy. He's pandering to the kiddie market now)