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Old 25th June 2008, 02:28 PM   #1
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Default whats makes sense to have class A amp?

Hi All,

Base on my own practical experience. I can be wrong too. Pls comments on this thread.

I always heard about Class A amp so I made one class A amp. Itís working fine. I had listened for many hours and compare with my class A/B amp. I am very much confused about the sound quality differences. Class A doesnít have much low bass power only have high frq and mid nice but not very much different with class A/B. Their are very minor difference I found in practical. When I listened same song using this two amps. Class A and class A/B not really much difference but A/B has more power to drive nice bass and treble too where class A is really failed to do the job in low frq. There is a question about class A watts too. mine is 30wrms. I am still very much confused why many are talking about class A amp, Class A amp is very good? i am not telling it is bad. As I am not electronics engineer, I could be wrong.

Pls write your comments. I want to understand, whats makes sense to have class A amp. whats the great difference in this two amp?

i will not stop to making my class A amp, i have to understand the logic behind.

Thank you
Michael
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Old 25th June 2008, 02:54 PM   #2
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Can you describe exactly what amplifiers you are comparing including the power supplies? General statements like "Class A doesnít have much low bass power only have high frq and mid" while entertaining are not very useful.
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Old 25th June 2008, 02:55 PM   #3
AndrewT is offline AndrewT  Scotland
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I would expect the ClassA to sound better in the bass not worse.
I wonder what you have done wrong?
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regards Andrew T.
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Old 25th June 2008, 04:06 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

Good Class A ( ~ 20w) vs. Good Class AB (lots more power) ?

Really good midrange on complex difficult material.
Bass end is a complete joke, not enough juice.

What I found for :
Sugden A21 or Kelvin Labs (both 20w) vs. Audiolab 8000A

/sreten.
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Old 25th June 2008, 04:10 PM   #5
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So that was the Sugden and Kelvin with good midrange and comical bass?
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Old 25th June 2008, 04:29 PM   #6
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Quote:
Originally posted by analog_sa
Can you describe exactly what amplifiers you are comparing including the power supplies? General statements like "Class A doesnít have much low bass power only have high frq and mid" while entertaining are not very useful.
hi,

Class A bass is not very bad but wk, not like AB very strong. i just made aleph-3, 30wrms for testing prpose. my power supply have more then enough ampire as its require. its only require 2.5ampire to 3 but mine is 10 ampire huge power supply. i am using 29v dc.
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Old 25th June 2008, 04:33 PM   #7
Mooly is offline Mooly  United Kingdom
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Hello Michael,
The quest for knowledge continues I see.
When you are comparing totally different amps it's very difficult to say whether any difference is down to the class of operation or other details totally unrelated.
I think I am correct in saying Doug Self published a design a few years back that could be run in all three classes, A, AB and B.
Perhaps something like this would be of use as you are listening to the same amp but running in whichever Class you want.
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Old 25th June 2008, 04:41 PM   #8
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Quote:
Originally posted by space2000

just made aleph-3, 30wrms for testing prpose.

Have you considered the possibility that you (or your speakers) don't like single ended bass rather than class A? How much capacitance do you have in the PS?
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Old 25th June 2008, 04:44 PM   #9
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Quote:
Originally posted by Mooly
I think I am correct in saying Doug Self published a design a few years back that could be run in all three classes, A, AB and B.

Let me guess: all three sound bad
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Old 25th June 2008, 04:45 PM   #10
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Hi mooly,

Thanks for comments. yes, its true. i was wondering what is the great dfrnce in btwn this two amps. if the dfrnce is only very minor then whats the point to have class A right? i am not expert but i was very much curious about it so i made it and still learning.

My friends are telling me to make one class A as they have one. so i was thinking to make one and see.

class A amp:
Clearity = good
high freq= good
mid = good
low = not good


class AB amp:
Clearity = not so bad
high freq= not very good
mid = good
low = very good

PS 40000uf as i have enough power in transformer.


thank you
michael
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