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Old 4th March 2006, 08:14 AM   #111
poynton is offline poynton  United Kingdom
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Quote:
Originally posted by jives11


Thanks Andy, any thoughts on the fourth link

I also noticed that the Right channel has no local ceramic on the +12v supply. The left Channel does and the -12v does. The +12v gets delivered all over the baord as well as the NE5532's. This supply is decoupled by 2627 (22uF). I use a starget here of 47uF but wonder if an alternative cap would be better given the dual role of supplying both analogue and digital supplies.



Hi,

OOPS - missed the one by that chip !!.

I would say replace with a 47uH choke and add a local bypass cap.

THINKS ... I have read somewhere that the filter chip should be fed with its own supply direct or was that the SAA7220 ??


All the chips should be decoupled as close as possible to the chip +/- as possible ie. very short leads to the pins of the chip.

Andy
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Old 4th March 2006, 02:48 PM   #112
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Default Another clone?

Hi.

I have just returned home, having braved the ice and snow here in N. Wales. While out, I came across a car boot sale - yes there are some hardy souls out there or should that be idiots?

Anyway, I picked up a Marantz CD74 for 3.00 !!

Works perfectly (apart from having had a bang on the front panel).

It looks like Marantz clone for a Philips 304 - cdm1, alloy chassis, same boards etc.

But the PSU is bigger and there is an extra Tx feeding the Display board.


Loads of space for modding !!

Anyone have any info??

Andy
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Old 4th March 2006, 04:57 PM   #113
Gasho is offline Gasho  Croatia
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One pretty good tweak for CDM1-2 based cdp is change of NE5514 quad OP for faster one like MC33079 or even better ones.
It is the first signal gain stage after photodiodes in laser pick up unit.

It is located on CDMs pcb integrated with mech.
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Old 4th March 2006, 05:08 PM   #114
poynton is offline poynton  United Kingdom
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Default Re: Another clone?

Quote:
Originally posted by poynton
..................I picked up a Marantz CD74 for 3.00 !!

Works perfectly (apart from having had a bang on the front panel)................
Unfortunately, the chassis was twisted and I could not straighten it. So I now have a spare cdm-1 (which is the quietest I have ever heard ) and boards for the CD74 - Anyone need spares?

Andy
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Old 4th March 2006, 05:28 PM   #115
tubee is offline tubee  Netherlands
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Poynton: build a new case around it, and make a toploader or something like Roberto's very design:

My new CD-Shuttle!
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Old 4th March 2006, 06:20 PM   #116
poynton is offline poynton  United Kingdom
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Originally posted by tubee
make a toploader or something like Roberto's very design:

Ah...now thats something !!!
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Old 6th March 2006, 08:13 AM   #117
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I have also modified a CD104, an excelent player in my oppinion. I use it to feed my headphone amp and Sennheiser HD-580.

The original clock has been replaced by a Tent-Labs version and the original I/V stage had been removed and replaced by a transisor version.
CD-104 modifications
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Old 6th March 2006, 08:38 AM   #118
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Quote:
Originally posted by MidiMaze
.......... the original I/V stage had been removed and replaced by a transisor version.............
oops
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Old 6th March 2006, 08:41 AM   #119
jives11 is offline jives11  Europe
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Quote:
Originally posted by MidiMaze
I have also modified a CD104, an excelent player in my oppinion. I use it to feed my headphone amp and Sennheiser HD-580.

The original clock has been replaced by a Tent-Labs version and the original I/V stage had been removed and replaced by a transisor version.
CD-104 modifications
Thanks MidiMaze
Nice site (and Pictures !) Wow you certainly managed to squeeze plenty into the chasis
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Old 6th March 2006, 09:45 AM   #120
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Quote:
Originally posted by poynton

oops
No oops in this modification. The old op-amp I/V stage doesn't sound as good as the transistor stage
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