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Old 7th October 2008, 07:39 PM   #10981
Thomo is offline Thomo  United Kingdom
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I can definitely agree with Ricardo that removing the dc blocking caps (the four Elna Silmics at the top right of the board) and bypassing the muting transistors is the first step.

Better electrolytics around upgraded opamps are also a must.

I know I'm re-covering old ground for most here, but I think it's great that this awesome thread is still attracting new interest and starting people out into great quality audio.

Cheers, Lee.
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Old 7th October 2008, 08:39 PM   #10982
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HI All
Yep will start out with aforementioned upgrades
OK itís up and running again but it seems to just sometimes start skipping on or around track 8/9 on any CD it seems but next time it plays fine any suggestions as to why this happens
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Old 8th October 2008, 06:15 AM   #10983
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by colin.hepburn2
HI All
Yep will start out with aforementioned upgrades
OK itís up and running again but it seems to just sometimes start skipping on or around track 8/9 on any CD it seems but next time it plays fine any suggestions as to why this happens
Hi Colin, and welcome.

Good to see you have also been infected with the tweaking-virus
And another player 'under the knife'...

Try cleaning the metal guide rod that the laser slides over. Very often the grease is old and hard, and that prevents the laser from sliding smoothly.

Regards,

Ray
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Old 8th October 2008, 05:58 PM   #10984
RCruz is offline RCruz  Switzerland
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Default DOS Mighty DOS

Hi Ray

You where right (again ).
After one week playing, the sound is now much more integrated, the dynamics are awesome as well as the bass information.

This proves that a CDP can sound as big as a good TT.

I am so amazed by these DOS results that I wonder if it is possible to build a similarly designed phono stage for the TT.

Regards

Ricardo
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Old 8th October 2008, 10:26 PM   #10985
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Hi Ray/All
Have checked and cleaned laser guides left it playing all day all seems fine now will do some of the upgrades on it but I am considering a Valve/Tube output stage on this thing
You thoughts on doing this would be welcomed
Cheers
Colin
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Old 9th October 2008, 03:49 AM   #10986
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Default Re: DOS Mighty DOS

Quote:
Originally posted by RCruz
Hi Ray

You where right (again ).
After one week playing, the sound is now much more integrated, the dynamics are awesome as well as the bass information.

This proves that a CDP can sound as big as a good TT.

I am so amazed by these DOS results that I wonder if it is possible to build a similarly designed phono stage for the TT.

Regards

Ricardo

Ricardo,
If you think music sounds good now, just wait a month or so!

Steve
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Old 9th October 2008, 07:21 AM   #10987
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Excellent stuff Ricardo

It is a must upgrade and welcome to the club

Brent
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Old 9th October 2008, 08:11 AM   #10988
6h5c is offline 6h5c  Netherlands
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Default Re: DOS Mighty DOS

Quote:
Originally posted by RCruz
Hi Ray

You where right (again ).
After one week playing, the sound is now much more integrated, the dynamics are awesome as well as the bass information.

This proves that a CDP can sound as big as a good TT.

I am so amazed by these DOS results that I wonder if it is possible to build a similarly designed phono stage for the TT.

Regards

Ricardo
Cool huh!

The story that parts need breaking-in is confirmed again.

A similar circuit for a phono stage is a whole different ballgame. Signal levels are very small (noise!), and RIAA correction must be implemented of course. There are good discrete designs floating around, a search will probably produce some threads

Quote:
Originally posted by colin.hepburn2
Hi Ray/All
Have checked and cleaned laser guides left it playing all day all seems fine now will do some of the upgrades on it but I am considering a Valve/Tube output stage on this thing
You thoughts on doing this would be welcomed
Cheers
Colin
I tried a valve output stage in this player, and it sounded very good. There are some pictures somewhere here in this thread of an experimental test setup. But the FET stage sounded equally well, so I decided to build it with silicon. I'm a tube-man, but in this case it's much easier without the high voltage and heater supplies!

Regards,

Ray
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Old 9th October 2008, 03:19 PM   #10989
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hi, i have bought some LM4562NA opamps, but i am not sure on how to fit them! could anyone help me on this? do they just slot into where the old opamps came out of. i have a cd63ki


thanks
chris
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Old 9th October 2008, 03:26 PM   #10990
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Hi

Yep direct replacements

Brent
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