Even worse, the author may actually have a clue but deliberately wrote the
article the way it was written. My guess is the marketing department is the
guilty party.
They may know the truth, or at least was told such by the engineering
department, but decided the truth doesn't make their product look better
than the competition.

You know how it goes; There's lies. Then there's damn lies. Then there's
statisticians. And then there's the marketing department.

Sparky377

"Stewart Pinkerton" wrote in message
...
On Sun, 04 Sep 2005 09:25:27 GMT, "Tim Martin"
wrote:


"Don Pearce" wrote in message
.. .

As far as I am aware, there are no class B amps around these days.
Anybody
know of any?

Presumably this "high end audio manufacturer" makes Class B amplifiers:

http://www.norh.com/docs/amps/

"... 99% of all audio amplifiers today are Class B. Class B amplifier can
be
built today so that its distortions are well below what the human ear can
detect and nearly to the point where it is unmeasurable.
Many amplifiers call themselves Class A/B. In reality, very few are. Early
Class B amplifiers had a problem known as switching delay. In a class B
design, a transistor works 50% of the cycle while another transistor works
50% of the cycle. In early class B amplifiers, there was a distortion
created between the time the devices were switching back and forth. Some
people referred to this distortion as notch distortion because there was a
notch appearance on an oscilloscope between the two waveforms.

Class A/B was created to leave the transistor conducting while the second
transistor was conducting. This created an overlap between the two
signals.
The problem with this approach is that it created its own distortion
called
gumming. This means that the signal would get a little fatter where the
two
devices were both conduction.

Today, if you look at a properly designed Class B amplifier on a scope,
you
will see no switching distortion."

No, the author is clearly clueless, and does not understand the
meaning of Class B - despite having quoted it at the outset.
--

Stewart Pinkerton | Music is Art - Audio is Engineering