TDA1541 to replaced by TDA1541A ? - diyAudio
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Old 21st April 2012, 05:51 PM   #1
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Default TDA1541 to replaced by TDA1541A ?

Hi,

I have a Philips CD650 which holds a regular TD1541 DAC chip

I also own a Philips CD582 which holds a TD1541A chip

Would it be worthwhile to remove the 1541A chip from the CD582 and move it into the CD650 ?

I.e. will this improve the sound quality of the CD650 in a noticeable manner ?

Thanks,
Bart
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Old 21st April 2012, 06:21 PM   #2
poynton is offline poynton  United Kingdom
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It's not worth it as a "stand-alone" change.

Tou"ll need to do a lot more to hear a substantial improvement.


Andy


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Old 21st April 2012, 06:50 PM   #3
Mayday is offline Mayday  Sweden
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I agree.
There's lots of relatively easy mods that vastly improves SQ from tda1541-based players/dacs though.
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Old 21st April 2012, 07:33 PM   #4
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Quote:
Originally Posted by Mayday View Post
I agree.
There's lots of relatively easy mods that vastly improves SQ from tda1541-based players/dacs though.
Well, inthe CD650 I am replacing all el. capacitors and replace the 2 opamps ne5532 with opa2134 (sockets so can be undone). Would it then be worthwhile to insert the A chip ?

Regards,
Bart
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Old 21st April 2012, 07:59 PM   #5
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It needs the associated SAA7220P/B too...
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Old 21st April 2012, 10:31 PM   #6
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No, you can use TDA1541A and SAA7220P/A together. The SAA7220P/B is an improved version.

http://www.dutchaudioclassics.nl/typ...aa7220p_a_b_c/

I also believed for long that TDA1541 and SAA7220P/A are a combo just as TDA1541A and SAA7220P/B but they are interchangeable. I think it was Rbroer who corrected me long ago. Maybe you can use the Search function to find it.

BTW TDA1541A is better than TDA1541 but of course there are other people claiming the opposite.

http://www.dutchaudioclassics.nl/Phi...D-A-Converter/
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Last edited by jean-paul; 21st April 2012 at 10:56 PM.
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Old 21st April 2012, 10:40 PM   #7
Mayday is offline Mayday  Sweden
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There are a number of mods that are quite easy to do.
Change DEM cap to a value that "locks", swap the tda's decoupling caps to film caps, put in a nos/re-clocking module(can be found on ebay) or provide the saa7220 with it's own regulator. I have not tried the nos/re-clocking module, but heard good things about it.
It all comes down to how much time, effort and money you are willing to spend I guess.
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Old 21st April 2012, 10:58 PM   #8
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A better clock makes a big difference in TDA based cdplayers. And if one wants to keep the SAA7220: it definitely needs a separate power supply for best results.
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Old 22nd April 2012, 12:24 PM   #9
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The clock is originating in the SAA7220, therefore that is one of the most critical cips for jitter generation.
The SAA7220P/B has better ROM coeficients and better jitter characteristics. Also the offset of 5% provided by the SAA7220P/A (necessary for TDA1541) is now reduced to 0.05% for TDA1541A, therefore eliminating the full-scale distortions.
There is no point of adding a better clock to a SAA7220P/A, because it will degrade the clock regardless...
Better power supply - yes (if original one is not sufficient). Usually on old CD players, the PS are not sufficient anymore because filtering capacitros are old and dry out. Just replacing those usually makes a big improvement. No need for fancyer work IMO.

Last edited by SoNic_real_one; 22nd April 2012 at 12:34 PM.
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Old 22nd April 2012, 12:52 PM   #10
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Well dear Sonic, while you weren't probably even born I was already modding Philips based cdplayers . Internet was non existent and we had to discover things by doing. I can tell a better clock will make a difference but SAA7220 still is a polluting chip, that is right. That won't change but after having modded tens of CD80's I can tell a better clock is eh ... a better clock. SAA7220 is a current eating bipolar chip that needs a separate supply to lessen its influence on the total outcome. It can easily be observed on a simple oscilloscope what better decoupling does for the SAA7220. It can also be removed altogether but after having see you performing in another thread on the non OS matter I will not even attempt to go there. Thanks for copying the info out of the links I gave myself. Replacing all electrolytic caps on 30 year old equipment is not a matter of choice but a necessity.

Since you started posting more frequently on diyaudio atmosphere has changed for the worse. It seems you are always in for a conflict. There are no weapons of mass destruction on diyaudio.com !
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Last edited by jean-paul; 22nd April 2012 at 01:01 PM.
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