"Eeyore"
Arny Krueger wrote:

"Phil Allison"

Yes, there are two problems with class A - both related
to the fact that with class A, the output stage always
has far more current flowing in it. (1) Power transistors tend to be
less
linear at high
currents - the beta falls off. Running an output stage
class A approximately doubles the current that the
output stage has to handle. So, you move the operating
point way out on the output devices. (2) Less SOA from the perspective
of
the load, because
the output devices are pulling so hard against each
other.


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

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, its real handy for that you seem to be so mentally incapable of
framing a proper technical reply. Everybody is going to dismiss your
ranting.

I'd personally like to see you claim that power transistors get more
linear
when run at very high currents and that there is no such thing as beta
fall-off at high currents.

Oh there is but since a classic Class A output has such high standing
dissipation you use more devices in parallel and you're actually working
them at
lower currents than in A/B.



** Correct.

Arny has made the same ASININE error in FOUR posts.

A "class A amplifer" is one DESIGNED to work correctly in that mode.

His wacky claim about peak device currents being higher in class A is FALSE.




......... Phil