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Old 1st September 2012, 08:40 AM   #1
kwm488 is offline kwm488  Hong Kong
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Default Sound more worse after replace cap

Hi
This Adam A7 come with D-K cap. Do anyone know what brand is it?

And I replace power amp cap to elna cerafine and blackgate

Preamp replace blackgate and cerafine too. And change to bc film cap. Opamp change to opa2107.

Power filter cap change to bc 146.

Do anyone can give me suggestion? What wrong?

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Old 1st September 2012, 09:15 AM   #2
jned is offline jned  United States
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Do you have an O-Scope to see what is happening?
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Old 1st September 2012, 09:26 AM   #3
Jay is offline Jay  Indonesia
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Looks like an active crossover with Gainclone amps. Better not change many things at the same time. D-K is cheap but very good sounding.

1) Make sure you have compared both opamps (other components being the same) to make sure the problem is not due to the opamp. There are many (SMD!) opamps, which one that you changed? All?

2) Small caps (mostly in nF) might be crossover elements. If so, you cannot replace them with different values. Tho may be they are the SMD ones.
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Old 1st September 2012, 10:05 AM   #4
tvrgeek is offline tvrgeek  United States
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Guess I have to suggest, are you sure you did not get counterfeit parts?

By worse sound, what do you mean?

You modified two boards. Which is causing the problem? Both?

I agree, it is likely an oscillation has been introduced. It looks like some of the caps are physically much larger. Were the values changed? You need to get a scope on it.
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Old 1st September 2012, 11:02 AM   #5
kwm488 is offline kwm488  Hong Kong
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Hi

I replace all the cap with same uf. S-K cap size small than normal cap. D-K cap sound very good?? You compare and get this result??

I stupid that I believe change all good componet will sound good. But I am wrong. I change all opamp to opa2107. My friend tell me original a7 sound better. I will know the result tomorrow.

How should I do now?
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Old 1st September 2012, 11:11 AM   #6
sandyK is offline sandyK  Australia
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Give the big electros plenty of time to stabilise. Some of the Audio Grade types are notorious for taking ages to stabilise.
Also, never do more than one modification at a time, and take the time to fully evaluate any audible changes.If in doubt, reverse the modification and listen again,
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Old 1st September 2012, 01:04 PM   #7
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by kwm488 View Post
I stupid that I believe change all good componet will sound good. But I am wrong. I change all opamp to opa2107. My friend tell me original a7 sound better. I will know the result tomorrow.
What do you mean YOUR FRIEND told you the original was better??? Have you compared by yourself? You cannot compare 2 components in an audio system when the other components (speaker, amp, etc) are not the same.

Cerrafine and Black Gate is fine for power supply (decoupling). You may have done some mistakes (is it easy to solder smd chips? I heard it cannot be too hot), or the Cerrafine/Black Gate is not original. But if the cap is "in signal line" (coupling), yes both BG or Cerrafine may sound inferior in certain system compared to cheaper cap that is good for coupling (but bad for decoupling).
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Old 1st September 2012, 01:17 PM   #8
jaycee is offline jaycee  United Kingdom
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what were the original opamps?
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Old 1st September 2012, 04:25 PM   #9
kwm488 is offline kwm488  Hong Kong
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Quote:
Originally Posted by Jay View Post
What do you mean YOUR FRIEND told you the original was better??? Have you compared by yourself? You cannot compare 2 components in an audio system when the other components (speaker, amp, etc) are not the same.

Cerrafine and Black Gate is fine for power supply (decoupling). You may have done some mistakes (is it easy to solder smd chips? I heard it cannot be too hot), or the Cerrafine/Black Gate is not original. But if the cap is "in signal line" (coupling), yes both BG or Cerrafine may sound inferior in certain system compared to cheaper cap that is good for coupling (but bad for decoupling).
i give me the modded A7 to my friend. my friend compare my A7 and his A7 (use his setup). so i think it is fair to compare. i will listen what different tomorrow, my friend will take my a7 back and his A7 too
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Old 1st September 2012, 04:26 PM   #10
kwm488 is offline kwm488  Hong Kong
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Quote:
Originally Posted by jaycee View Post
what were the original opamps?
opamp is JRC 2068. what is it? i never hear 2068 ic
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