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From: "Phil Allison"
References: <email@example.com> <firstname.lastname@example.org>
Subject: Re: 'Current Dumping' Amplifier Circuits ?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Mon, 2 Dec 2002 23:11:28 +1100
NNTP-Posting-Date: Mon, 02 Dec 2002 23:00:40 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Kevin Aylward" wrote in message
> Phil Allison wrote:
> > "Roger Lascelles" wrote in message
> > news:email@example.com...
> >> I think Wirless World (as it was then) ran an article which
> >> explained the idea. From memory, they showed a high power class B
> >> power stage with lots of crossover distortion and a lower powered
> >> class A (?) stage which added an additional contribution to the
> >> output to cancel out the distortion of the Class B. Idea is that a
> >> rugged output stage with no thermal runaway but mediocre linearity
> >> can work with a low power fast & clean amp.
> >> It may be unnecessary - other high quality audio amps do not use it.
> > ** Proves what ??
> It forms a good indication, for *whatever* reason, that any positives of
> the technique, are outweighed by the negatives.
** This comment conveys no information - except about the writer.
> In general, it appears that the use of the technique is simply not worth
> the "bother".
> > If I>> was building an amplifier, I would not bother.
> > ** A comment about yourself.
> And your point would be?
** It pretends to be about the subject - but is not.
> The poster asked for an opinion, Roger gave one.
** Yes, but not not about the subject but instead his own fuzzy
> > If I chose a Quad amp, it
> >> would be becuase it sounded good and was priced right - not because
> >> of current dumping.
> > ** It is a nice feature, that others lack.
> What's specifically nice about it for the *user*?
** The "nice" is not something an average user would be aware of.
> From a technical point of view, it removes the requirement to adjust a
> bias pot, but other then a potential very modest cost effect, is of no
> relevance to a user.
** Right - and the Crown DC 300 A is a crap amp. We have an expert
for sure here.
It also reduces the standing current in the output
> stage, but again, this current is merely moved to the class A driver
** I removes output bias current and all the associated bias stability
issues that affect THD at low levels. That is nice.
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