100w class A or 200 w class AB ????

One point missed: a 100 watt 'real' class A amp would use enough electricity to power your whole house, just idling. And it would serve as a great winter heater too. (the 'real' because even very good class A amps change over to AB at some point in the power range)
My little baby class A amp a Forte' 4 at 50 watts channel uses $10 worth of juice a month when it was connected to my Infinities... ,when connected to my Maggies the same left on all the time amp uses only $5 worth of electricity... SEAN TELL ME WHY!!!!)

Elizabeth,
did you check the price per kilowatt-hour?

Murlalman1,

1.Direct coupling can even be done with digital amplifiers between the stages as well as at the speaker binding posts.
It has nothing to do with class of operation.

2.Any amp with no feedback will oscillate. A feedback is a-must in input and driving stages.

3.Class A allows to minimize the feedback at the output stage but presence is still helpfull and very often even neccessary.

Eliz: I agree with some PP - SETS stay in class A.(least we confuse someone)

Muralman: yes, class A can do with less or no global feedback (local is another story) but that is a different issue than we started which was if a Class A nominal 100 W amp devivers more power than a nominal 200W AB because it is class A.

I'm pretty much a SET person these days but I think feedback has gotten a bad rap. 15-20 years ago lots of poor designs used too much feedback in an attempt to compensate for poor design. Feedback took in on the chin. I'm not crazy about it but I think it's to generally scorned sometime.

Sincerely
I remain

I read Plinius likes class A because the load on the power supply does not fluctuate