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Old 8th December 2010, 09:13 AM   #1
ljm_ljm is offline ljm_ljm  China
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Default No sense of imitation GOLDMUND

Imitation of the imitation that day is really depressing, since spent hundreds of thousands of TAH ocean Comrade purchase Audioprecision system two years, Humou people to walk in smiling

We look at the official published information goldmound it:

FREQUENCY RESPONSE
These figures are valid for any level between 0 and nominal power.

+ / - 1 dB, 6 Hz - 0.4 MHz.
+ / - 3 dB, 3 Hz - 1 MHz.
INPUT SENSITIVITY

Nominal level: 1.4 V.
Input impedance: 50 k.
GROUP DELAY
Propagation delay <100 ns stable with frequency from DC to 200 kHz.
DISTORTION
Figures valid for all levels from 0 to 40 V / 8 Ohms.

Dynamic: TID <0.01% (- 80 dB).
Static: THD + N <0.01% (- 100 dB).
SPEED

Slew rate:> 240 V / m s.
Rise time: <400 ns.


N Humou people look so years ago, the measured data sample machine:


Just look at the data that can spike the text of the original high (do not come to those who counterfeit blending a).

Some may question, the real audition will happen? Unfortunately, indicators of high-paper did not dare to let out the spectrum, or to see the first figure to know; Do not worry, to the real audition, when the opponents blind listening very likely will die faster, TAM is the use of such comrades numerous blind listening comparison Dayton won a free dinner
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Old 8th December 2010, 10:03 AM   #2
h_a is offline h_a  Europe
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Well, you know cloning an amp 100% identically is not possible.

PCB layout and wiring/grounding is a big issue that might hold back best performance. Though I guess you will be close.

In my little KSA-50 clone I used modern high speed transistors and had to redo frequency compensation that in the end worked so much better than the original one (that was simple Miller with huge cap).

Is the sound going to be identical? Dunno, I hope it's even better
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Old 8th December 2010, 11:06 AM   #3
Bonsai is offline Bonsai  Taiwan
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Hats off to you h_a for decoding this post. I am completely lost! What are the plots? A real Goldmund? a clone?
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Old 8th December 2010, 11:21 AM   #4
h_a is offline h_a  Europe
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Hi Bonsai,

well, it was just a guess

From what I saw there was recently an attempt to clone a Goldmund amp and, of course, if you put a clone on the bench one generally gets different numbers compared to 'official' ones.

Might be technical issues, different measurement setup or simply marketing

EDIT: I just looked at the plots, the usual dynamic range and THD vs. input level/vs. frequency stuff. Not sufficient to say anything about frequency response or slew rate.

Last edited by h_a; 8th December 2010 at 11:23 AM.
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