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From: "Phil Allison"
References: <firstname.lastname@example.org> <email@example.com> <3DKC9.467$Lq.firstname.lastname@example.org> <9p3D9.email@example.com>
Subject: Re: Class B amplifiers: what are the large low-value resistors for?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Fri, 22 Nov 2002 10:56:54 +1100
NNTP-Posting-Date: Fri, 22 Nov 2002 10:46:45 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Ban" wrote in message
> Phil Allison wrote:
> > "Kevin Aylward" wrote in message
> > news:k30D9.211$DS1.firstname.lastname@example.org...
> >> Phil Allison wrote:
> >>>>> ** Many commercial power amps produced since the late 1960s
> >>>>> operate with the main output devices completely cut off at idle -
> >>>>> or pure class B. The Crown DC300 and DC300A were early examples
> >>>>> along with most later Crowns and Phase Linears and many clones.
> But the DC300 is _not_ a class B amp AFAIK.
** The output devices operate at zero bias current - they are in class
** It is a hybrid of a class AB drive stage and class B current
but DC coupled, which
> made a lot of problems with offsets and plugging in cables when the amp
** Most SS amps are DC coupled to the speaker. The DC300A was a DC to
30 Khz amplifier intended originally for lab use. In a domestic hi-fi it was
smart to fit an input cap.
If you know how to treat it, it is an excellent piece of gear, serving
> even as a adjustable power supply.
** Yep, in bridge mode you get dual tracking !
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