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Old 23rd April 2013, 05:38 PM   #4151
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Translate once again. I hope you can guess I translated.
Original author was published in http://BBS.hifidiy.NET/forum.php?mod...ead&TID=802976.


I translated in QQ??
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Old 23rd April 2013, 06:01 PM   #4152
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X_cg518 the author of this article was published in
On the http://BBS.hifidiy.NET/forum.php?mod...ead&TID=802976.


Translate once again. I hope you can guess I translated.
I would like to see a more accurate translation, I can study English better.



Talking about tube amplifier
Will say that even the number of harmonic rich sense of hearing rounded transparent adjective
Talking about the transistor amplifier
Said odd harmonic distortion harsh digital sound or other bad sound
The above statement is wrong.
Today I will correct this wrong.
Everyone thinks that even harmonics is even rounded sense of hearing
Odd harmonics harsh dissonant
According to this view the second harmonic good sense of hearing
3rd harmonic should be harsh and dissonant
I am very ruthless speak --- In fact, this statement is wrong!
These two distortion
Does not have a very poor sense of hearing would not have a good sense of hearing.
I can say that the 3rd harmonic distortion and second harmonic distortion is the same,
Fundamental human ear can not hear the difference.
Why?
Speak not according, pictures to explain everything.
Harmonic distortion of the amplifier tube amp 2 times harmonic
Maximum-60db (not total harmonic distortion that is too general) is 0.1% distortion

In fact, this figure is very low,
More obvious for everyone to see
About simulation with 10% distortion to demonstrate

Green is the fundamental,
Red for 10% distortion
Blue is the synthesized waveform.

First look at 2 times the harmonic distortion.

Click the image to open in full size.
In the picture you can see the blue waves of the-20db huge distortion,
But some tilt and did not see the new waveform components generated,
In fact, the waveform of the human ear can not distinguish it from the green fundamental difference,
The single-ended amplifier is easy to produce such a distortion.

See followed by 3 times harmonic distortion.

Click the image to open in full size.
This is like 2 times harmonic distortion, Also no new waveform generating,
this huge distortion just makes the blue waveform peak becomes more rounded,
The third harmonic distortion, the human ear can not distinguish it from the difference between the original waveform and green,
Any amplifier before Xiao Bo, easy output distortion.

See followed by a 4-times harmonic distortion.
Click the image to open in full size.

4 harmonic distortion is obviously not the same as 2 times, 3 times,
You can see the waveform has been distorted,
This is obviously a new waveform to generate,
This waveform human ear can clearly hear the (case) there are fundamental components other than the
That is dissonant sound generator,
class-B and class-AB amplifier likely to have this distortion.

See followed by a 5-times harmonic distortion.

Click the image to open in full size.
And the top four new waveform,
Do not explain,
Class AB amplifier (Note that there is no B) most prone to the distortion.

See last 6 times harmonic distortion.

Click the image to open in full size.
Like 5 times 4 times,
B and B class prone
"Students" to ask,
Here did not seem to prompt a push-pull Class A amplifier prone to distortion,
The answer is: not here say any distortion the enlarged waveform is infinitely close to the green fundamental (perfect).
Then high harmonic distortion similar to the 4, 5, 6 have the new waveform which seriously affect the sense of hearing.

Concluded that:
Tube amp so-called even-order harmonic distortion (in fact, only 2 times, 3 times, few, there is no more, because this is a Class A power amplifier)
Even multiple of the harmonic distortion is not rounded source of the sense of hearing, in fact, this is the sense of hearing is not affected.
4 times higher harmonic multiples appears embodied nice feeling (no high frequency noise generated)
This point of view and I talked about in this post are unified.
http://bbs.hifidiy.net/forum.php ...&extra=page%3D1
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Old 23rd April 2013, 06:20 PM   #4153
generg is offline generg  Germany
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Hi Chen,

Interesting, this way to show what harmonic distortion does, is new to me, I will read it just now once more to get better the content.

Two remarks....

First Nelson often says that there are many people liking dominant k2 as well as k3....

So J2 is heavily k2 dominant and M2 k3 dominant, both amps please to many people.

Second when you look at the BAF talk about the F6 you can see similar small deformations of the distortion waveforms Nelson produces by changing the phase of K2.
One conclusion is clear to me.... Better no higher distortion than k2 and k3
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Last edited by generg; 23rd April 2013 at 06:28 PM.
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Old 24th April 2013, 02:17 AM   #4154
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Hi generg,

P3 and P4 I can't buy here, I can find the lowest value is 100 ohms. It can be

replaced with 100 ohm?

BAF what does it mean?
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Old 24th April 2013, 06:55 AM   #4155
generg is offline generg  Germany
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Burning Amp Festival =BAF

http://www.firstwatt.com/pdf/art_f6_baf.pdf

I look if I have still 4 X 10R for you...

The 100R should be possible.
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Old 24th April 2013, 09:58 AM   #4156
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geographical reasons, shopping is a big problem. Express is not so easy.
The F6 DIY for my friend.
Next time, when I DIYF6 to myself, I'm not made of PCB,
I will use it like the old-style tube amplifier as welding.
Easily change the original circuit.
I will try a different circuit.
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Old 25th April 2013, 03:14 AM   #4157
The Dastardly Dad of Three
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Kiven, Lite 8 in Guangzhou has them at least down to 20 ohm. The value i don't think is very critical. rgds
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Old 25th April 2013, 08:44 AM   #4158
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Thank you
I find it on taobao today
BOURNS10ŷ_Ա
But I don't know that is genuine.
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Old 25th April 2013, 12:17 PM   #4159
Zen Mod is offline Zen Mod  Serbia
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Old 25th April 2013, 04:08 PM   #4160
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In this case, you want the government involved.
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