Anyone heard of Kinergetics? - Page 2 - diyAudio
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Old 17th August 2006, 03:13 AM   #11
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How much idle current do Class A's usually draw? Is it much more than AB's. Are they pretty inefficient even with no signal fed to them or do they have some sort of shutoff?
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Old 17th August 2006, 08:59 AM   #12
SY is offline SY  United States
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A true class A amp draws the full current it is capable of at all times. They are stunningly inefficient. This is why so many manufacturers cheat and call an AB amp with sliding bias a "class A" amp. I mean, it's class A! Class A! That's got to be better than Class B! After all, a grade of A is much better than a grade of B in school! I think that this psychology, along with hair-shirt audiophilia, is more responsible for class A's reputation than any real sonic advantages (just my opinion after 40 years of playing with this stuff).

Rule of thumb: if it's a 100W class A amp, it had better be monstrous big with huge heatsinks and put out waves of heat. If not, it's not actually class A except in the marketing sense.
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Old 17th August 2006, 09:46 AM   #13
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Hi SY,

I think you definition of class A relates only to single-ended, I made the same error just a few days ago on a french forum.

The real definition of class A is that neither branch of the push-pull ever ceases conduction. Both branches are always in conduction.

With an idle current of 1 A, a push-pull amp can deliver 1.99 A to the load, there is 10 mA passing through the other branch and it still class A.

Is sliding class A real class A ?
Audibly, I won't say anything.
By definition, it should be because classes are defined by the various possibilities of conduction of the branches not by the idle current :
class A : both branches are always conducting
class B : one branch at least is conducting
class C : branches are never conducting at the same time


May I suggest this link to class A amps fanatics
http://www.audiodesignguide.com/PowerFollower/
This is the only amp I am aware which draws a constant current from the power supply and is in a shunt mode with the load, just like some voltage regulators.
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Old 17th August 2006, 10:13 AM   #14
SY is offline SY  United States
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If you accept that definition, as opposed to an operating angle definition, then ALL amps are class A, since even at cutoff, there's some current flowing.
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Old 19th August 2006, 03:02 PM   #15
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Quote:
Originally posted by excetara2
Did they sound good?
The Class A model rates very good in my book(KBA-75, Parasound lookalike)
The high power AB models are excellent for parts recycling.

ps: cooling of the Class A model was by a fan/heatsink duct combo.
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Old 19th August 2006, 03:30 PM   #16
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Two things: First, I think Poobah should be a standup comedian. His "It's good that so many can spell historheesus though..." comment still has me howling. I don't want to sit in the first row, though. Second, I think that there Mark Levinson ML-2 qualifies as full class A. 25 Watts into 8 ohms (mono), 6 amps from the wall at idle. You could make waffles on it. It drew less current from the wall at clipping.
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Old 20th August 2006, 10:04 PM   #17
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Default Re: Anyone heard of Kinergetics?

Quote:
Originally posted by excetara2
Planning on buying one from a friend but he doesn't have it set-up anymore. All I know is it is a Pure Class A design. Anyone heard anything about this brand or heard this amp? Thanks.
I think most of the Kinergetics stuff was designed by Tony Di Chiro. It was fairly well built stuff. I'd put it in the Aragon/Bryston/B&K build quality. Stereophile has a couple of online reviews for their products that are favorable.

If you know the model number, I can give you a few more details about it.
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Old 21st August 2006, 06:21 AM   #18
diy guy is offline diy guy  Singapore
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Hi

This is the internal of the Kinergetics KBA75.

I found it in one of the chinese web link.
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Old 21st August 2006, 10:46 AM   #19
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Quote:
the internal of the Kinergetics KBA75.
Look Ma,
an uneven number of output devices and they're all NPN !
Good shot, DIY GUY.
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