On Thu, 15 Apr 2004 14:03:06 -0400, "Arny Krueger"
wrote:

That is usually the case. The early stages of the main part of the
power amp circuit often run off the same source as the output
devices. In other cases there is some built-in extra filtering.

http://www.citycom.gr/electronics/pr...l/100ampl5.gif
shows a fairly typical design. Everthing runs off the same voltage
source as the output devices.

If by 'extra filtering' you're talking about C9 and 1, then it's not
really very useful-

I'm not talking about that at all. Sorry for any possible lack of clarity. I
intended this to be an example of a power amp where everything runs off the
same basic voltage source as the output devices.

No, I don't understand. You said 'In other cases there is some
built-in extra filtering,' and you provided a link to an amp that has
local smoothing provided by capacitors 8 and 1. Now you say you
weren't 'talking about that at all'.

As a rule, tweaks such as this just don't have any practical technical
advantages.

And of course we all know that pretty much every nominally competent
amp (in terms of measurement) sounds just like any other of same . . .

--
td