A big ars PSU is never wrong🙂
i have a push-pull class A. wich can deliver 26.4A peak pr ch. THAT is headroom. and with only 24V rails. it can with without problem deliver full power into 0.8ohm.
show me the standar class A/B amp that can do the same😀 a 2X25W class A/B amp that delivers 26A peak. i'd like to see that.
i have a push-pull class A. wich can deliver 26.4A peak pr ch. THAT is headroom. and with only 24V rails. it can with without problem deliver full power into 0.8ohm.
show me the standar class A/B amp that can do the same😀 a 2X25W class A/B amp that delivers 26A peak. i'd like to see that.
Yours is running class AB If its delivering 26 amps. Either that or you have O/P stage biased to 13amps
Sliding bias won't make it easier to achieve classA sound, but SE-A1 will, because good sound easily achieved by classA not because of its 360dg conductivity, and many class A amps also sounded so bad and high freq fatiguing.
Negative feedback in delayed system if not carefully applied do have much portions to sound stages and also easily makes unpleasant sound and fatiguing.
It is really difficult to get the "best" amplifier sound. If the amplifier set to most natural and pleasant sound it will lost its imaging, and if it set to good imaging there will be more fatiguing, but there still some way to combine it, when ears accept the imaging and well adapted.
If AudioSan is running an Aleph he has made a slip in describing it as a push-pull amplifier. The Aleph series of amplifier stages are biased by constant current sources including the output.
In the latter case there is a circuit that will increase the standing current which will allow increased power to be drawn (pulled out) and delivered to lower impedances.
Nelson Pass designed these amplifiers and describes them as being single-ended and that sets them apart from push-pull Class A designs like his A40 of 1978.
I downloaded a Service Manual for the Aleph 3 several years ago. I don't know if these are available on line any more. This operates from +/- 25 volt lines and is rated for 30 watts into 8R at 0.2% distortion at 1KHZ. This increases to 60 watts into either 4R or 2R both at 1%.
I would expect the Aleph 5 circuit would be much the same. Perhaps AudioSAn can elaborate on the current capacity and distortion figures. I would not think 0.8R loads would feature in the specifications.
Michael J
the PSU can deliver 26A. but yes. it would run in class A/B at this Levels🙂
i would not try this with only the 2 pairs of output doh😀
no. its not aleph. its F5.
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Your two posts confirm that your ClassAB output of 26Apk is from a ClassAB amplifier.
You have given us the evidence you were asking for.
Actually I won't get into that,I'll say the damping factor of a class-ab/b is awesome!!!why? because most of the peak in class-a will go into ground...😀
Yes, that time classB amplifiers are very limited in speed, then they got problem with class b section that wasn't as good and smooth as they need. Is that correct?
The problem with the SE-A1 was more to do with Class B distortions from the floating power being impressed on the Class A section.
There is a well regarded Technics amplifier with a similar model designation which is a far better attempt at emulating Class A performance. This is the SE-A1000 which uses the Class AA system. In this an output push pull amplifier is arranged to present a very high impedance load on a voltage amplifier. This works to reduce distortion through a bridge arrangement which eases the needs for negative feedback and stability.
Michael J
There is a well regarded Technics amplifier with a similar model designation which is a far better attempt at emulating Class A performance. This is the SE-A1000 which uses the Class AA system. In this an output push pull amplifier is arranged to present a very high impedance load on a voltage amplifier. This works to reduce distortion through a bridge arrangement which eases the needs for negative feedback and stability.
Michael J
still. we were talking PSU. wich standar (un-modified) class A/B amp With +/-23-25V supply out there have a PSU that can deliver 26A peak? that was the question.
if (or when) a push-pull class A goes A/B it still is a class A amp. all push-pull class A amp goes class A/B at some point.
this is by the way something you self make sure to point out when ever you can!
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Seasonal Affective Disorder?
If you run a class A amp for a few hours every day for one decade, it costs more for energy than it costs to build the amp. And then if you run air conditioning, the energy cost is magnified even further. So it is a costly proposition, Mr. Moneybags.
realy? so. i use 300W spot lights in my livingroom. for 2 years now. around 8-12hours a day. 365days a year. it have not cost me £1600 yet🙂 faaaaaar from it.
hope you Cook only ones a week. it can be to expensive🙂 you can run å class A amp for 5-8 hours for 30min on the stow.
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not that cheap😀 nothing in this country is cheap😀
i've spent around £3000 on electricity the last 2.5 years. inkl heat in the Winter, Cooking, lights and class A sound😀
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yes. you have a reduction on that,. norway is a good ex for that😀 we have a white and a green winter😀 i have some heat on all the time. 365 days a year.
but GB have much the same climat that we have, so🙂
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I'm in Silicon Valley, California, and I blissfully leave my 15W class A amp switched on 24/7 during the 3 non-summer months, as the extra heat is not unwelcome then.
I just felt the need to point out that the long term 'hidden' energy costs of running in class A dominate over the initial build cost -- IF one does not need an extra source of heat and also has to pay twice to also get rid of it. But you knew that...
I just felt the need to point out that the long term 'hidden' energy costs of running in class A dominate over the initial build cost -- IF one does not need an extra source of heat and also has to pay twice to also get rid of it. But you knew that...
aha. i thats not GB😀 but sure. if you use as much power to get rid of the heat, as you do on making the heat. then it will begin to cost you. but if that is the case, then a wider Experiment on aircolling at a low cost is more of an issue.
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