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Technics SL-PS900
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Old 13th July 2019, 12:28 PM   #31
Max Headroom is offline Max Headroom  Australia
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Location: West Australia, near to the beach, natural ambient sounds mostly.
Quote:
Originally Posted by Trident View Post
Some observations:
- The MASH is only a commercial name for the same technology. DELTA-SIGMA that exceeded the limitations of linear dac. Philips had a winning horse, the TDA1541A, with superb and dark sound (not bright to his ears, surely) but left behind by the BITSTREAM, another commercial name for the same technology as the MASH, and so the rest of manufacturers. ........They are all MASH with another name.
Sure, these are all oversampling noise shaping DACs, the point is that these noise shapings all sound different.
In the nineties I spent shedloads of time modding MASH and other cdp's so I gained useful insights into the causes of 'signature'.
MASH is clear, detailed, bright, impressive etc but to my ear, slightly 'falsely' so, and ultimately I found it to be fatiguing even annoying.
I respect Panasonic's noise shaping work but it is not for me, others may find differently
Good luck with your 1541 DAC project, a complex board with long signal paths !.
I am using an Ebay $40.00 USB DAC with ES9023 convertor...with some slight mods I can't find fault with it, how times have changed.


Dan.
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Old 13th July 2019, 12:47 PM   #32
Trident is offline Trident  Spain
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The signal routes will be short, the idea is to replace the first pair of OPA627 by tubes and leave the second pair to switch if I want output by operational. Possibly restart the project from scratch because I have another new board.

be good DAC ES9023?
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Old 14th July 2019, 09:06 PM   #33
Trident is offline Trident  Spain
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Completed the change of capacitors on the main board, in general I have respected the values ​​of all the capacitors, except a few.

For the capacitors located in the feeding sections not related to the audio process, I used Panasonic FC, I think it is an excellent choice.

For capacitors located in feeding sections related to audio, such as digital audio processor, DAC, or operational've ridden Elna Silmic II, which provide some improvement in performance of the player.

All 0.1uF ceramic capacitors have been replaced by wima the same value and added film capacitors SMD Series Panasonic ECHU (X) are shown in the picture in red circle. (I'll have to remove some of the solder in the solder)

The sound in general I think is better now, but it is a very personal opinion.

The next step is to replace the electrolytic capacitors of the power supply by Panasonic FC, here I have no doubt.

The two large capacitors of 3300uf will be replaced by Mundorff Mlytic (Audio Grade) of 4700uf. and 100nf capacitors will be added between terminals throughout the section.

I hope to receive the rest of the material Monday or Tuesday.
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