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CLASS A POWER RATINGS

In well designed SS class A power amps I was told that although power could increase to double in class AB mode from speaker demands of  8 ohms to 4 ohms, class A suffered to be cut in half.

For example a class A denominated amp rated at 50 watts class A into 8 ohms would double to 100 watts class AB  into a 4 ohm load but only have 25 watts of class A power before switching to class AB.

But I've noticed of late claims of manufacturers stating their amps double their class A power as impedance demands are halved.

So is the explanation that technology has advanced ?

rost

Showing 1 response by clearthinker

clearthinker's avatar
clearthinker
1,582 posts
 

@yyzsantabarbara 

I read the specs.  The amp runs in Class B and has a circuit that senses when there is a peak in the programme.  It then puts the amp into Class A before the moment of the peak, so it can be fully reproduced.

OK read that again please.

That is of course impossible.

Without a time machine.

Krell called it an 'anticipator' circuit.  But of course it cannot anticipate.

If you want Class A, like I do, the Krells to buy are the pure Class A KRS200s like mine.  Class A, the whole Class A and nothing but Class A.

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