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Old 22nd July 2006, 05:37 PM   #11
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From memory I think it is in a small potted box
You're right - I was wondering what that might be. This box prevents me from installing proper rca outlets - so, might I despense with it without any negative influence? Then I will have the space to fit some rca connectors.
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Old 22nd July 2006, 05:39 PM   #12
anatech is offline anatech  Canada
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Hi audio-kraut,
Paul is saying that they used the standard (for the day) vicious high order filter to roll off the response. I still have the extra filter module as spares. That chip set does not do SPDIF out. I am thinking that I may feed the RF into another demod / filter / DAC on my Nakamichi OMS-7 (same chip set with dual TDA1540 DACs).

Depending on the filter design, it may ring. I never bothered to look at them closely. The sound was not appealing, the Nak filter is a different beast again.

I think your DAD-7000 used a nicer filter as well. If you peek inside the black box that moves freely near the back of the unit, you will see a pair of NE5534AP op amps surrounded by a bunch of polystyrene caps, also some electrolytics. The resistors appear to be metal film types.

Sometimes it's not so much the DAC (that is the main thing), but how you treat the audio signal afterwards that makes CD players sound so different from each other.

-Chris
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Old 22nd July 2006, 05:45 PM   #13
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Quote:
Originally posted by audio-kraut


. This box prevents me from installing proper rca outlets - so, might I despense with it without any negative influence? Then I will have the space to fit some rca connectors.
I had my dealer remove the captive lead and fit phono's but I have no idea what he did with the box. Together with a decent cable (cant remember what) it made a very considerable improvement.
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Old 22nd July 2006, 06:07 PM   #14
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Hi anatech,,
would it make much of a difference to remove that filter? I cannot look into mine - it is completely epoxyd.
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Old 22nd July 2006, 06:08 PM   #15
anatech is offline anatech  Canada
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Hi Paul,
OMG!
Make sure that box is in there. With any luck, the plastic was removed and the board remounted. The filters I have use flat cables, one with a connector attached. Of course I may be mistaken and this is a later version. The fact is that you still need the filter to keep the hash out of your system.

-Chris
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Old 22nd July 2006, 06:11 PM   #16
anatech is offline anatech  Canada
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Hi audio-kraut,
I depends a great deal on your system. I would not run a CD player without any filtering on my system. I think your filter is the earlier version of the one I showed a picture of. I'll bet they added muting transistors and a buffer. Using a relay instead of the muting transistors may improve the sound quality.

I thought I had a manual for that machine ........ still looking.

-Chris
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Old 24th July 2006, 02:28 PM   #17
jives11 is offline jives11  Europe
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Hi audio-kraut. There are some longish threads on things you can do with a Philips CD104 which is the same machine.

The two best thngs I found were :

1) the opamps output has a couple of DC block caps . From memory around 47uF. I removed these as my preamp is not DC coupled, and fitted links. You could replace them with better cas, maybe bipolars

2) i replaced the +/-12v decoupling caps, again I *think* 47uF. These provide the supply to the opamps and you can fit a couple of cerfaines here.

I'm not too sure what the Mission filter did, but I actually like the old 14bit sound from my CD104. The top end can be a little hard, but the bass is very good and the build quality is very fine. The player can be plagued by intermitent faults, which there are well documented fixes for. They are mostly due to dry joints caused by the 'griplets' philips used to link through the boards with. Removing these and soldering wires through is a fiddly process but worth it for me. The player now plays from cold everytime.
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Old 25th July 2006, 09:30 AM   #18
GJF is offline GJF  United Kingdom
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From memory the potted filter fitted in the DAD7000 was a comb type designed to work in conjunction with the existing CD104 filter.
I remember the DAD7000 I relaced griplets on some 15 years ago was somewhat smoother sounding in the high treble than the CD104 on which it was based but also a little drier in the bass.
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Old 23rd September 2009, 04:46 PM   #19
manxman is offline manxman  Isle of Man
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Default Anyone got a manual

Hi,

I have a DAD 7000 but the closest manual I can find is for the Philips CD104 and its in German.
I am planning to carry out some of the tweaks mentioned elsewhere on this forum for the CD104.
Has anyone got some feedback on these?
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