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In Reply to: RE: Ah, but that's the point ... posted by Naz on August 18, 2016 at 01:13:21
"A preamp with only minimal swing requirements could happily run Class A at numerous operating points along the load line"
So let's take a V8 motor and fill two cylinders on one side with concrete. Now it's a V6, right? It certainly meets the minimalist requirements some here are attempting to apply to amplifiers.
To your comment - no one is discounting a reasonable modification of the operating point as being included in the classification. But operating an AB1 power amp so it never goes to cutoff doesn't qualify. That's not reasonable. An amplifier must be operating near the midpoint of its curve to be Class A. That description is sometimes omitted for the sake of brevity, but it's just as important to the definition as any of the other requirements. Anyone who doesn't like this criteria is welcome to hold a séance and argue the point with those long-dead engineers.
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Buy Chinese. Bury freedom.
Follow Ups:
If a V8's Management system turns of 4 cylinders when not needed what would YOU call it?
It's mode of operation at any given time is what describes it most accurately but only while it is in that mode.
We can argue endlessly about the engine's configuration, capabilities, where it spends the most of it's time etc etc and that's one of the problems ... or opportunities for marketers:)
To me, the engine example is akin to hardware and software/firmware in a microcontroller. Another analogy is SE and PP. This is the configuration, (the hardware, V8 or V6). But PP could run in various classes either permanently or conditionally, akin to the programming in the V8 that can turn cylinders off.
Naz
Your V8/V6 analogy with cemented cylinders is pretty weak. A much better one would be a V8 with cylinder deactivation technology. In this case one could ask the question: If the engine is never pushed hard enough to activate the last two cylinders is it a V8 or a V6? . I know how most would answer this question.
Regarding classes, you state operation "near" midpoint. What is "near"? How far can one deviate from near before it's no longer A? The problem with these definitions is ambiguity and there seems to be a reluctance to address it.
Good thing the question wasn't, 'when is a V8 a V4?' because the side, and entirely correct answer would be when Honda builds one to avoid the cylinder count limit...32 valves, 8 connecting rods, 8 spark plugs and 4 combustion chambers...LOL
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
intensional definitions
extensional definitions
demonstrative definitions
precising definitions
ostensive definition
"In classical thought, a definition was taken to be a statement of the essence of a thing."
Just like there is more to the term "definition" than might meet the eye, there is more to Class A than just not reaching cutoff.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
"The problem with these definitions is ambiguity and there seems to be a reluctance to address it."The ambiguity is minor and has no impact on our understanding of the definition. There was no need to address it 50 years ago, and none now. Only those who want to materially change the fundamental meaning and intent of "Class A" have a problem with this.
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Buy Chinese. Bury freedom.
Edits: 08/18/16
If the intent is to operate the tube in as linear a way as one can then the details aren't all that important.
If the intent is to operate the tube in the non-linear cutoff region while still claiming Class A because "the current never cuts off" the whole intent of Class A is being ignored and some of the potential benefits of Class A (over class AB) are being thrown away.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
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