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In Reply to: RE: Class A amp keeps shutting down posted by Palustris on August 03, 2014 at 10:11:29
Thw writer is correct.
First the anecdotal evidence. We have a Yamaha CA-800 integrated amp that's switchable into class A. It runs hottest at idle and cooleer the louder it's played. We played it loud for about an hour once and it's the coolests it's ever been after being on for a while.
Second: Class A amps dissipate a constant amount of power. The louder they're played the more of that power they dissipate in the load (the speakers) and the less in themselves. They also draw (nearly) constant current and power from the wall. You can check that with a Kill-a-watt or other such device. In fact that's the easiest way to check whether a claimed class A amp is truly class A.
We had a Bedini "Class A" amp in some time ago that didn't sound class A and didn't measure class A. I suspect it used some sliding bias technology and/or sliding rails to claim class A.
Class A is woefully inefficient and generally really good-sounding.
Follow Ups:
"Class A amps is that they dissipate more heat at idle than at full power."
"Class A amps dissipate a constant amount of power."
These statements are mutually exclusive. The first statement violates the definition of Class A the second statement is correct.
This statement violates the second statment:
"The louder they're played the more of that power they dissipate in the load (the speakers) and the less in themselves."
Say a given Class A amp draws 300W of power from the wall socket.
It will always draw 300W if idling or close to clipping.
When idling all of those 300W get turned into heat, when it is playing some watts go to the speaker and the rest gets turned into heat.
Hope you get the idea because I can't really dumb it down any further but none of the statements violate each other. Kinda obvious if you think about it.
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