Marantz CD63 & CD67 mods list - Page 55 - diyAudio
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Old 5th February 2006, 02:36 PM   #541
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Hi Franz,
Have You additional transformer to analog or digital section?
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Old 5th February 2006, 02:47 PM   #542
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by 6h5c


......... The circuit sounds very good, but I have some HF noise present in my tweeters. .....
Or a noisy tube or FET ??

I would also be tempted to play with the values of the 620pf caps ?? The original circuit has more filtering - a passive filter may also be an answer??

Andy
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Old 5th February 2006, 06:24 PM   #543
Franz G is offline Franz G  Switzerland
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Quote:
Have You additional transformer to analog or digital section?
It's for the analog section.

Quote:
Franz,

Do you have a schematic of the passive circuit you use?
Is there any noise residue with this passive circuit?
Absolutely no noise, just music!

Gerald Gessner is selling his modifications, so I am not allowed to publish the exactly circuit.

It is really just a LC filter, 1mH in series with the signal, 10 nF to ground.

And: no output cap!

When I use this player with my DC coupled PL519 amp, then I have absolutely no cap in the signal path after the DAC chip.

Franz
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Old 5th February 2006, 06:30 PM   #544
Franz G is offline Franz G  Switzerland
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Quote:
How close does the tray come to the Tx / board??
Very close: just one or two millimeters left between the tray and the Tx

Franz
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Old 5th February 2006, 08:47 PM   #545
poynton is offline poynton  United Kingdom
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Hi 6h5c,

Sorry - just a couple more questions!

I have just breadboarded my version - not connected to the cd-p yet. Nothing went BANG !!!

Did you use ecc88?
What B+ did you use?
Did you check the current through the FET?
What voltage did you get at the A-K junction.

Andy
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Old 6th February 2006, 10:26 AM   #546
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Morning.

Just a little update on my player.

I used sound deadening material on cdp and amp and I am very impressed with the out come. The bass is deeper and the treble is more controlled, I knew it would help but not this much

I have also changed the 7918 for a 7912 for a dimmer display.

I have now finished my reg pcb fully, I now have an Audiocom super reg for the +5V clock reference on the DAC.

Here is a pic of reg and of pcb......dont know where the tube stage will go. lol

Click the image to open in full size.
Click the image to open in full size.
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Old 6th February 2006, 11:52 AM   #547
SimontY is offline SimontY  United Kingdom
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Mmmm, nice mate!
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Old 6th February 2006, 03:22 PM   #548
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I have just taken off the bottom plate of the KI and bonded it with Aluminium paste (used to repair gearboxes etc). I wont come off now. lol

I did this has I felt it was not making the best contact across the whole chassis as it could so damping was suffering.
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Old 6th February 2006, 03:42 PM   #549
Biskit is offline Biskit  United Kingdom
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Any news on the custom TX.

I'm thinking of potting my frame tranny in a mu metal can.

Gordon
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Old 6th February 2006, 03:45 PM   #550
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by rowemeister
I have just taken off the bottom plate of the KI and bonded it with Aluminium paste (used to repair gearboxes etc). I wont come off now. lol

I did this has I felt it was not making the best contact across the whole chassis as it could so damping was suffering.
Hi.

One thing I noticed, about my '63SE, was that the bottom plate when hit really rattled!!!!!!!!! I suggested, earlier in the thread, that glueing it down was a good idea also a 12mm mdf 'plate' glued to the underside adds to the chassis damping and stiffness.

Andy
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