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Old 9th November 2006, 11:03 AM   #1
@lf is offline @lf  Bosnia and Herzegovina
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Default Suggestions for CD960 audio out cap replacement

I want to replace two resistors and 100uF/25V ELNA Cerafine cap (see attachment) in my Philips CD960.
What is the purpose of this cap? If I remove it what will happen?

Where to find Auricap in Europe?

Any suggestions?...

thanks
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Old 9th November 2006, 02:52 PM   #2
Alien8 is offline Alien8  Belgium
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Replace with what ?

Cap blocks DC (there will be a measurable voltage across it), one resistor is for short circuit protection (mute transistors), the other one is for output impedance/high pass filter.

For auricap try maybe intertechnik in Germany. But that's from the top of my head, so there may well be a better option.

HTH

BTW, if your CDP output schematic is the same as the CD950, then removing the 3 (!) muting transistors also does a lot to the sound.
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Old 9th November 2006, 07:00 PM   #3
@lf is offline @lf  Bosnia and Herzegovina
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Quote:
Replace with what ?
With better capacitor. BlackGate, Auricap... ?

Quote:
BTW, if your CDP output schematic is the same as the CD950, then removing the 3 (!) muting transistors also does a lot to the sound.
CD960 has no muting transistor. Only relay. See attached schematic...



In the meantime I removed this ELNA Cerafine 100uF/25 V cap and sound improved.

I suppose that sound will improve even further if I replace resistor with
better one (Vishay...?)
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Old 9th November 2006, 07:17 PM   #4
lucpes is offline lucpes  Europe
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Quote:
Originally posted by @lf

In the meantime I removed this ELNA Cerafine 100uF/25 V cap and sound improved.

I suppose that sound will improve even further if I replace resistor with
better one (Vishay...?)
Check for DC offset on the rca out and remove the 4k7 resistor too.
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Old 9th November 2006, 07:18 PM   #5
poynton is offline poynton  United Kingdom
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hi.

Since all recent opamps are shortcircuit proof, you can remove both caps, replacing the 100uF with a wire. Both resistors can also be removed. As the muting is by relay, leave it in place. You will not gain anything by removing it as you would if the muting was by transistor. [most amps are capacitor coupled so a little DC on the input will do no harm]

Further improvements can be had by removing ALL the headphone amp circuitry [if fitted] and by replacing the opamps.

By far the greatest improvement will be had by replacing the clock with a better one [with it's own power supply]

Andy
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Old 10th November 2006, 12:49 AM   #6
@lf is offline @lf  Bosnia and Herzegovina
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Quote:
Originally posted by lucpes

Check for DC offset on the rca out and remove the 4k7 resistor too.
Thank you for your advice.
I have cap at the input of my 41Hz AMP4. I suppose this cap will block DC?


Quote:
Originally posted by poynton

Further improvements can be had by removing ALL the headphone amp circuitry [if fitted] and by replacing the opamps.

Andy
I removed headphone amp month ago and replaced opamps with AD825 at the same time.


Quote:
Originally posted by poynton
hi.

By far the greatest improvement will be had by replacing the clock with a better one [with it's own power supply]

Andy
Yes. I already replaced clock with LCAudio clock with separate power supply.

Thank you for your advice.
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Old 10th November 2006, 05:05 AM   #7
Alien8 is offline Alien8  Belgium
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I just saw the CD960 uses a TDA1541

If so, maybe try to feed it the low jitter clock directly (2.8 Mhz!) The benefit of your clock upgrade will be even better.

Also, you can replace the rectifier diodes with better ones. Cap upgrades for the power pins of selected IC's is also a good idea.

happy modding

I originally thought it was very similar to a 950, but then again... my mistake
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Old 10th November 2006, 10:30 AM   #8
lucpes is offline lucpes  Europe
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Quote:
Originally posted by poynton

Both resistors can also be removed.
Andy
I would leave the smaller value series one, it is there to isolate the opamp from any parallel capacitance down the chain (cable, input on next amp). It is standard practice and does not have any real influence in sound.
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Old 10th November 2006, 02:06 PM   #9
@lf is offline @lf  Bosnia and Herzegovina
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Alien8

Quote:
Post #7
I just saw the CD960 uses a TDA1541
I replaced TDA1541A at first with TDA1541A S1 (single crown)
and than with TDA1541A S2 (double crown). Still I'm not sure which one sounds better... Can you explain in detail (maybe shematic or picture) how to feed tda with the clock directly as you mentioned. I already replaced xtall with LClock... Or if you can point where to search for the info... [/QUOTE]


Quote:
Also, you can replace the rectifier diodes with better ones. Cap upgrades for the power pins of selected IC's is also a good idea.
I already replaced diodes with shotky. But still there are two more sets of diodes waiting for replacement.


Quote:
Cap upgrades for the power pins of selected IC's is also a good idea.
Caps are ELNA Cerafine and I doubled capacity with the same Cerafine caps (100uF/25V).

Also added 50.000uF caps after rectifier section.
Result of that mod was huge improvement.


Thank you for your help and info.
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Old 10th November 2006, 02:09 PM   #10
@lf is offline @lf  Bosnia and Herzegovina
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Quote:
I would leave the smaller value series one, it is there to isolate the opamp from any parallel capacitance down the chain (cable, input on next amp). It is standard practice and does not have any real influence in sound.
lucpes

Thank for the advice. What kind of high quality/low noise resistor do you reccomend in this place?
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