Don Pearce wrote:

Eeyore wrote:
Jim Lesurf wrote:
Rob wrote:
Jim Lesurf wrote:

FWIW it means very little to me. You seem to assume a correlation
between frequency, resistance and sound.

Not sure what you mean, I'm afraid.

That much is apparent. Doubt you know much about the concept at all, nor the
bases of stability.

Can you explain then? It has me puzzled too. And given Jim's
background I am going to tell you he knows precisely what stability
means, and how to measure and predict it.

How many amps has Jim designed that have sold in the many tens of thousands ? And
been VERY reliable.


Stability circles are the second thing you learn about on the Smith
Chart.

And there's far more than one way to make an amp stable other than simple
dominant pole compensation. Just the output stage configuration and topology ( to
take yet another aspect ) can make a VAST difference. I actually got 'caught out'
once designing a new amp where the DC beta of the output devices was more than
adequate yet the load impedance would reflect back to the last voltage driver
stage, affecting phase margin.

Result, one extra emitter follower stage added and NO load would result in phase
related instability. The voltage driver stage's load was essentially constant as
a result of the change. It's not difficult really once you get the hang of it.

Graham


--
due to the hugely increased level of spam please make the obvious adjustment to
my email address

Jim Lesurf wrote:

I've just put up a new webpage that provides some
measurements on the
properties of a variety of loudspeaker cables. The page is
at

http://www.audiomisc.co.uk/HFN/Cables3/TakeTheLead.html

It is an expanded version of the article published in 'Hi
Fi News' a few
months ago.

Thank heavens for Hi Fi News.

Of course I rushed out to buy my wonderful Isolda cables
immediately. With the old Maplin leads, *anything* might
have been happening. After all, some amplifiers have some
problems with some other cables, and since we don't know
which amplifiers, or what problems, or which cables, it's
better to be on the safe side.

Treated myself to a matched pair of Cosmic Flux Pyramids,
just to be sure.

Ian

"Ian Iveson"
Jim Lesurf Criminal wrote:

I've just put up a new webpage that provides some measurements on the
properties of a variety of loudspeaker cables. The page is at

http://www.audiomisc.co.uk/HFN/Cables3/TakeTheLead.html

It is an expanded version of the article published in 'Hi Fi News' a few
months ago.


Thank heavens for Hi Fi News.

Of course I rushed out to buy my wonderful Isolda cables immediately. With
the old Maplin leads, *anything* might have been happening. After all,
some amplifiers have some problems with some other cables, and since we
don't know which amplifiers, or what problems, or which cables, it's
better to be on the safe side.

Treated myself to a matched pair of Cosmic Flux Pyramids, just to be sure.


** That is almost funny.

Academic ****s like this " Jim Lesurf " character are a POX on the face of
the earth.

They think and write in a social vacuum, with a criminally reckless
disregard for the obvious consequences.

Other examples include:

1. Matti Otala , who did ENORMOUS HARM with his asinine, phoney " TIM
" bull****.

2. Walter Jung and Richard Marsh, who did ENORMOUS HARM with their
witchcraft like approach to using capacitors.

Both the above played RIGHT INTO THE SLIMY HANDS of a small army of
*scumbags and charlatans* who were just WAITING to exploit the fake
credibility these pukes writings provided them with.

Plus and as a DIRECT result, many honest and thoroughly expert designers
& makers of audio gear, all round the world, were almost or actually put out
of business.

PLUS:

Any IMBECILES who purchase audiophool speaker cables DESERVE to have
their stupid, audiophool amplifiers BLOW UP !!!

Only that might put the vile, cable scammers out of business.



..... Phil

In article ,
Phil Allison wrote:
Academic ****s like this " Jim Lesurf " character are a POX on the face
of the earth.

They think and write in a social vacuum, with a criminally reckless
disregard for the obvious consequences.

Other examples include:

1. Matti Otala , who did ENORMOUS HARM with his asinine, phoney "
TIM " bull****.

2. Walter Jung and Richard Marsh, who did ENORMOUS HARM with their
witchcraft like approach to using capacitors.

Both the above played RIGHT INTO THE SLIMY HANDS of a small army
of *scumbags and charlatans* who were just WAITING to exploit the
fake credibility these pukes writings provided them with.

As usual you have jumped straight in without reading and digesting the
article.

It is merely a series of test results. Unlike those from others designed
to sell some snake oil product. If you had actually read it you'd know
that any conclusions from the data come in a later article.

Plus and as a DIRECT result, many honest and thoroughly expert
designers & makers of audio gear, all round the world, were almost or
actually put out of business.

Some may have deserved to be.

PLUS:

Any IMBECILES who purchase audiophool speaker cables DESERVE to
have their stupid, audiophool amplifiers BLOW UP !!!

And articles like this might just help those see the error of their ways.

BTW, potty mouth, where is all your research published? Since you claim to
be such an expert in everything?

--
*If you remember the '60s, you weren't really there

Dave Plowman London SW
To e-mail, change noise into sound.

"Ian Iveson"
Jim Lesurf Criminal wrote:

I've just put up a new webpage that provides some measurements on the
properties of a variety of loudspeaker cables. The page is at

http://www.audiomisc.co.uk/HFN/Cables3/TakeTheLead.html

It is an expanded version of the article published in 'Hi Fi News' a few
months ago.


Thank heavens for Hi Fi News.

Of course I rushed out to buy my wonderful Isolda cables immediately. With
the old Maplin leads, *anything* might have been happening. After all,
some amplifiers have some problems with some other cables, and since we
don't know which amplifiers, or what problems, or which cables, it's
better to be on the safe side.

Treated myself to a matched pair of Cosmic Flux Pyramids, just to be sure.


** That is almost funny.

Academic ****s like this " Jim Lesurf " character are a POX on the face of
the earth.

They think and write in a social vacuum, with a criminally reckless
disregard for the obvious consequences.

Other examples include:

1. Matti Otala , who did ENORMOUS HARM with his asinine, phoney " TIM
" bull****.

2. Walter Jung and Richard Marsh, who did ENORMOUS HARM with their
witchcraft like approach to using capacitors.

Both the above played RIGHT INTO THE SLIMY HANDS of a small army
of *scumbags and charlatans* who were just WAITING to exploit the fake
credibility these pukes writings provided them with.

Plus and as a DIRECT result, many honest and thoroughly expert designers
& makers of audio gear, all round the world, were almost or actually put out
of business.

PLUS:

Any IMBECILES who purchase audiophool speaker cables DESERVE to have
their stupid, audiophool amplifiers BLOW UP !!!

Only that might put the vile, cable scammers out of business.




..... Phil

"Dave Plowman (News)" wrote:

As usual you have jumped straight in without reading and digesting the
article.

The effect of pure shorts and opens is an ASININE concept, completely out of
touch with the real world.

Graham

--
due to the hugely increased level of spam please make the obvious adjustment
to my email address

In article ,
Eeyore wrote:
As usual you have jumped straight in without reading and digesting the
article.

The effect of pure shorts and opens is an ASININE concept, completely
out of touch with the real world.

Nothing wrong in covering everything on such an article. As certain
speakers may well *tend* towards a short or OC at certain frequencies.
It would be an entirely different matter if this research was being used
to sell or promote some product.

--
*Why is 'abbreviation' such a long word?

Dave Plowman London SW
To e-mail, change noise into sound.

In article , Eeyore
wrote:


"Dave Plowman (News)" wrote:

As usual you have jumped straight in without reading and digesting the
article.

The effect of pure shorts and opens is an ASININE concept, completely
out of touch with the real world.

Thanks, Eeyore. :-) You have just confirmed that you haven't understood
that their use is part of a standard *practical* technique for impedance
measurements. That largely explains your failure to understand the content
of the article.

I have already tried repeatedly to explain this to you, but I think I can
now conclude that - so far as you are concerned - this was a waste of time.
So I can save the effort of trying to explain it to you again.


Slainte,

Jim

--
Please use the address on the audiomisc page if you wish to email me.
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Armstrong Audio http://www.audiomisc.co.uk/Armstrong/armstrong.html
Audio Misc http://www.audiomisc.co.uk/index.html

Phil Allison wrote:

"Ian Iveson"
Jim Lesurf Criminal wrote:

I've just put up a new webpage that provides some measurements on the
properties of a variety of loudspeaker cables. The page is at

http://www.audiomisc.co.uk/HFN/Cables3/TakeTheLead.html

It is an expanded version of the article published in 'Hi Fi News' a few
months ago.


Thank heavens for Hi Fi News.

Of course I rushed out to buy my wonderful Isolda cables immediately. With
the old Maplin leads, *anything* might have been happening. After all,
some amplifiers have some problems with some other cables, and since we
don't know which amplifiers, or what problems, or which cables, it's
better to be on the safe side.

Treated myself to a matched pair of Cosmic Flux Pyramids, just to be sure.

** That is almost funny.

Academic ****s like this " Jim Lesurf " character are a POX on the face of
the earth.

They think and write in a social vacuum, with a criminally reckless
disregard for the obvious consequences.

Other examples include:

1. Matti Otala , who did ENORMOUS HARM with his asinine, phoney " TIM
" bull****.

2. Walter Jung and Richard Marsh, who did ENORMOUS HARM with their
witchcraft like approach to using capacitors.

Both the above played RIGHT INTO THE SLIMY HANDS of a small army of
*scumbags and charlatans* who were just WAITING to exploit the fake
credibility these pukes writings provided them with.

Plus and as a DIRECT result, many honest and thoroughly expert designers
& makers of audio gear, all round the world, were almost or actually put out
of business.

PLUS:

Any IMBECILES who purchase audiophool speaker cables DESERVE to have
their stupid, audiophool amplifiers BLOW UP !!!

Only that might put the vile, cable scammers out of business.

.... Phil

You have my 100% agreement again. Is Jim Lesurf one of those out-of-touch
academics that never have to build a product that has to work in the real world
?

Graham


--
due to the hugely increased level of spam please make the obvious adjustment to
my email address

In article ,
Eeyore wrote:
You have my 100% agreement again. Is Jim Lesurf one of those
out-of-touch academics that never have to build a product that has to
work in the real world ?

I'll answer for Jim in case he's modest. He designed a variety of amps for
Armstrong which were very well regarded. I had experience of a tuner amp
which sounded very good indeed.

What well regarded commercial designs are you responsible for?

--
*It IS as bad as you think, and they ARE out to get you.

Dave Plowman London SW
To e-mail, change noise into sound.