Why would anyone want class AB amp when class A always sounds better ?


Cost ? Heat? Reliability?
inna

Showing 23 responses by inna

No, this is not going green at all. I would personally compensate with other things, and others could too.
So, with less than capable speakers and headphones class AB can sound better ? Even if we are talking about excellent class A amp ?
Orpheus10, I don't have such a hearing as you imply, but my ear is quite sensitive to some aspects of a sound. 
Let's not transform this thread into tubes/transistors debate. Sure, ultimately tubes rule.
That's what we are trying to talk about - designs without compromises or almost without compromises. Heat, space, cost, look - this is all BS, just certain side effects. Done right it should always be full Class A design. And since Class A requires high level power supply, that's an additional advantage, that's where it all starts - with a power supply.
I like equipment that gives me good sound, other than that I only like tape decks. I don't think that liking good sound and liking good music are always in conflict. They can be but not necessarily so.
Old Levinson ML-2 class A amp is a dream piece.
I can design a horrendous class whatever amp too. That's not the point. No, design is a lot but it is not everything. There are limits of what is possible.
Orpheus10, there are great SS preamps, they are expensive and one can probably do better with tubes for the same or less but I don't know it.
Boulder, Gryphon, D'Agostino, Soulution, Accuphase etc.



Orpheus10, I would say that tube phono stage is most important. SS class A line level preamp and class A power amp can be quite acceptable, at least.
Most people, if not all, do prefer class A amps and integrated amps from the same company, be it Accuphase or Luxman or Pass.
Big Boulder and Gryphon are stable down to negative impedance. Oops, slight exaggeration, but I was close. Down to 1 ohm, I think.
You see. Ralph too says yes, class A is the way to go.
So you guys dump your second rate stuff and get real. But whatever you do I certainly will.
Well, class A is not exactly ecologically sound design, that's true. But it is my only objection. 
Anyone has Mark Levinson ML-2 to spare ? I don't think so. Old Gryphon ? Nothing again. Very bad. 
I am sure George and some others could offer an explanation of what happened beyond just formal power ratings.
I like Loreena and Dante's Prayer track is one of her very best. 
Miller didn't say a bad word. If he wants to sound right - fine.
Going too far into the subjectivity will get us nowhere.
I mentioned D'Agostino class AB amps as being more than competitive.
Maybe his class A amps would've sounded even better. I bet, he didn't want huge size and heat, so he opted not to do it.

D'Agostino amps might be an exception in that they are top level and can compete with almost any SS.
Yes, mapman, done right they do. 
Gryphon, Accuphase, Pass, Luxman etc.
"Some feel" funny things, that's for sure.
Yes, they are sometimes applicable.
Miller, what's wrong ? Give us an example. I'll give it myself. Gryphon Diablo 300 class AB integrated sounds better than Sugden class A integrated. But it's not a fair comparison, not what I mean, of course.