Collection of Class B topologies <100mA Idle and Sound closest by Class A - Page 3 - diyAudio
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Old 26th April 2011, 09:55 PM   #21
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Originally Posted by Tajzmaj View Post
And some of these amps are still in production.
Best regards
This I haven't heard and is therefore for me a new information. In that country is the currently manufacturing?
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Old 27th April 2011, 12:45 AM   #22
Tajzmaj is offline Tajzmaj  Slovenia
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I don't know all the details....maybe in china but still for uk brand....but check....
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Old 27th April 2011, 02:12 AM   #23
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New Class A, Super-A, Non-Switching : need a revival ?

Post#6
Non-Switching SEPP stage on the right half of the drawing...

Last edited by kenpeter; 27th April 2011 at 02:15 AM.
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Old 1st May 2011, 11:29 AM   #24
ontoaba is offline ontoaba  Indonesia
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Originally Posted by Jon Lord View Post
The Technics SE-A100 uses not very good OPamps for driving the power stage. With more recent ones like the LME series, you get better performance. The Class AA circuit also suffers from a kind of "thinking error", which let it operate only at sub optimal performance. The reason of this i don't know, probably patent infringement issues or whatsoever.
Thanks John.
I am also has experience using opamp buffering output stages. I found that using TL082 is more pleasant than 4580, but 4580 has better high freq result.
I need both pleasant and better, so I am decide to use bc557b (only 1xBC557B, 4x1N4148, 2x4k7R, 1x22R, 1x195R, 1x220uF, in floating sullpy) in SE classA and it better than 4580 and still very pleasant.

Hi, Tief,
ClassA and SEclassA has very different character. SE is natural for half and not for half. The most natural sound from loudspeaker is when you tap it, underdamped, and damped with resistor will sounds most natural and very pleasant.
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Old 1st May 2011, 12:02 PM   #25
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Quote:
Originally Posted by tiefbassuebertr View Post
Until now, it is still a challenge, to create a solid state power amplifier with <100 mA quiescence current through the power output devices and sound quality like pure class A at the same time.
)
My class AB designs have all had very low bias currents yet sounded great.
I run about 10ma through the output MOSFETs.
Peavey have a similar approach to low bias currents.
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Old 1st May 2011, 01:01 PM   #26
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Originally Posted by ontoaba View Post
Hi, Tief,
ClassA and SEclassA has very different character.
SE is natural for half and not for half.
The most natural sound from loudspeaker is when you tap it, underdamped, and damped with resistor will sounds most natural and very pleasant.
I don't understand this marked term. But perhaps you mean the same as to read about the first mentioned URLs by post #1 from URL
Inspiration for future ZEN Versions - basic description of Italians 400.000 $ Amp
Quote:
Originally Posted by nigelwright7557 View Post
My class AB designs have all had very low bias currents yet sounded great.
I run about 10ma through the output MOSFETs.
Peavey have a similar approach to low bias currents.
Without direct comparison for checking sound charakter several other Class AB designs sounds good. An example are the topologies from the diyaudio member X-pro (Creek, Cambridge Audio), have a look to the URL
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But what say the listeners in case of direct comparisons against single ended class A like ZEN or DOZ?

BTW - 10mA idle current through the output MOSFETs - this sounds more to Class-D than Class-B, does't it ?
Please let us know an URL for schematics from this topologies.
You say, that Peavey have a similar approach to low bias currents. Which models from
http://www.peavey.com/support/search...ved.cfm?page=M
you mean ??

Last edited by tiefbassuebertr; 1st May 2011 at 01:19 PM.
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Old 1st May 2011, 04:30 PM   #27
ontoaba is offline ontoaba  Indonesia
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Quote:
Originally Posted by tiefbassuebertr View Post
I don't understand this marked term. But perhaps you mean the same as to read about the first mentioned URLs by post #1 from URL
Inspiration for future ZEN Versions - basic description of Italians 400.000 $ Amp
I think that water and air is similar, if you shake your hand or something in water, you may feel natural movement of your hand. SE is not 100% natural, and it need more to move the loudspeaker more natural.
Voltage driving is when your hand moving according its position, current driving is its force, power is VxI. Natural driving for complex waveform is none of that three, You could calculate it from physics rules. When you tap your loudspeaker, when maximum displacement, when maximum velocity, when maximum force. Then, find the formula of natural sound. Many people are really wrong in driving loudspeaker, they think it is just a resistor.
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Old 1st May 2011, 06:52 PM   #28
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if that were the main rule alone, it would be easy to get the perfect amplifier topology
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Old 1st May 2011, 11:33 PM   #29
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Yes, so easy. SE is the most natural but only half, some enhancement will make it very pleasant. My buffer with bc557b is handle the loudspeaker through a power gain output stages, driving loudspeaker directly from SE classA is waste power.
SE classA alone isn't enough. I am using another secret buffer and non linear damper. Still I can't reach as good as if my amp driving headphone directly. Headphone with my output stage is so beautiful. Much beautiful when compared to CDROM headphone output, or when using my soundcard or opamp based buffer.

Last edited by ontoaba; 1st May 2011 at 11:35 PM.
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Old 2nd May 2011, 01:38 AM   #30
Bigun is offline Bigun  Canada
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Originally Posted by ontoaba View Post
I am using another secret buffer and non linear damper.
Fascinating. Pitty it's a secret
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