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Old 17th January 2006, 11:29 AM   #301
6h5c is offline 6h5c  Netherlands
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Nothing to add to the above....

The 'slower' playing that you mention is a typical Marantz thing. It will be gone after you mod the player.

Ray.
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Old 17th January 2006, 11:31 AM   #302
avr300 is offline avr300  Denmark
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I'll just fire up my Weller.

Especially good if the slowness can be cured. Can anyone pinpoint the slowness - or even better, the cure for it?
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Old 17th January 2006, 11:37 AM   #303
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Op amps, Hdam bypass and output caps removed is a good start.
Also a nice clock

Just for starters of course
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Old 17th January 2006, 11:37 AM   #304
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by avr300
I'll just fire up my Weller.


Yes, I've got one of those. Great - you can solder everything in one go!
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Old 17th January 2006, 11:38 AM   #305
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by Biskit


Also I've replaced the ribbon cable from the transport to the main PCB.


What did you replace it with???

Any photos?

Andy
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Old 17th January 2006, 11:57 AM   #306
6h5c is offline 6h5c  Netherlands
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Quote:
Originally posted by avr300
Especially good if the slowness can be cured. Can anyone pinpoint the slowness - or even better, the cure for it?
Hi,

If you read the TNT article you will find a little jitter experiment on the first page. It seems to be jitter that is responsible for the slow, smooth sound. So I guess an external clock with a clean power supply will do the trick here, as well as better PSU arrangements around the DAC.

Ray.
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Old 17th January 2006, 12:00 PM   #307
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Hi everyone,

an extremely educating thread, thanks a lot.
I'll order parts right now to cure my CD-67

One suggestion:
When spending so much time AND money to get the best out of these machines,
I see no reason NOT to go for a dedicated custom-made transformer

Quote:
Originally posted by poynton
The display section was the reason I kept the Marantz transformer - sourcing a 'better' custom one would be expensive!
A custom-made toroid is not that expensive when you order, say, ten of them.
I participated in the group buy for the Pedja Rogic DAC's toroid (made by Antrim)
and worst thing were the shipping charges for those heavy beasts.
Trannies for the Marantz won't be that heavy.

However, with the experience of this groupbuy I tend to say that having toroids
manufactured in Germany and then shipped to the buyers will give significantly
lower prices for everyone - including you in the UK.

This is because of:

- slightly lower prices from the manufacturer
- lower german VAT
- *much* lower shipping

Which voltages and VA-ratings would be needed in addition to those of the standard trannie?
If we can agree on one type of toroid I'd volunteer to ask for some quotes...
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Old 17th January 2006, 12:04 PM   #308
6h5c is offline 6h5c  Netherlands
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Hey, i'm in! For two pcs. at least!

Aside from the present voltages there should be maybe three? extra 9VAC windings for separate powering of the DAC and clock. Could a 30VA be enough?

Ray.
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Old 17th January 2006, 12:06 PM   #309
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True and a good idea.But isnt the KI toroidal tx a custom made one anyway?

Its supposed to be a custom oxygen free copper winding jobby.

For CD63 and SE I fully agree
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Old 17th January 2006, 12:18 PM   #310
6h5c is offline 6h5c  Netherlands
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For a KI it would be more sensible to use the original tranny and add a small one for separate supplies. But for the 63/67/SE/OSE it can be the same tranny.

We will need at least:

3x 9V for clock and DAC supplies??
1x 3,5V for display heaters
2x 9,6VCT for internal 5V and +/- 10V for drivers
2x 17,6VCT for +/-12V for opamps
1x 13,6V for display Vftd

These values are from the 63 schematics and the 67 will also run on that. Since most of the voltages are regulated, they can be rounded off to nice values.

Ray.
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