"Arny Krueger"


Agreed again. Building a truely Class A power amp that
can deliver significant amounts of power output is
really a pretty awesome thing. The OPT stage quiescent
current has to be equal to the *peak* current that is
delivered to the load.

** Absolutely FALSE.

The peak load current is *exactly* double the idle
current for an amp operating in class A.

Agreed.


** Self contradiction - right here.



The idle current flow in one device of a pair increases
to double while the other drops to just under zero at
peak level.

Agreed.

That double value current peak flows entirely via the
load to the common point.

Agreed.

Very basic stuff.

So what's your point?


** You are WRONG !!



You just broke down what I said down into steps.


** I JUST COMPLETELY CONTRADICTED YOU

- YOU ****WIT !!.




We all know that speakers can be capacitive-reactive and
can jack the load current to unexpectedly high levels. A
common power amp will have +/- 80 volt DC rails and may
need to deliver up to 15 amps peak to the load.

** Such a power stage has a rated output of over 500
watts and so HAS to use at least 8 large output devices.

Irrelevant.


** Shame how it is MASSIVELY relevant.



So, now the OPT is dissipating 2400 watts per channel
just sitting there, not counting internal losses.

** What a load of complete DRIVEL !!!!

What's your number, Phil? Remember, we are talking about a class-A output
stage that delivers 80 volts peak and 15 amps peak.


** Therefore it runs at 7.5 amps idle.

It also dissipates 1200 watts spread over at least 20 large devices.


Arny - leave commenting on power amp design to people who know something
about it cos they spend their lives dealing with it at component level.

Cos YOU do not have a bloody clue.





........... Phil