Marantz CD63 & CD67 mods list - Page 97 - diyAudio
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Old 24th February 2006, 10:15 AM   #961
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Quote:
Originally posted by awpagan


they are using pcm****'s
very hard to read

have you got the schematic of how the used the HDAM's

looking at using passive filter to fet buffer.

have you seen the D1 output?

allan
PCM1716
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File Type: jpg cd17 mk3 hdam small.jpg (68.5 KB, 448 views)
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Old 24th February 2006, 10:39 AM   #962
awpagan is offline awpagan  Australia
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Quote:
Originally posted by rowemeister


PCM1716
hmmm
digital filter built-in

allan
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Old 24th February 2006, 10:45 AM   #963
awpagan is offline awpagan  Australia
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rowemeister
send me an email and i'll email you

allan
ray would be interested in this version HDAM
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Old 24th February 2006, 10:47 AM   #964
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I can't email you allen, it says you don't accept them from forums.

Send me one mate from my link

PCM1716
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Old 24th February 2006, 11:01 AM   #965
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I have a CD17-MkII.
When the machine is in pause mode I get significant noise on my mV meter. However it is not audible. RF trash ? Shouldn't the output be in the mute state ?
Cheers,
Ashok.
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Old 24th February 2006, 11:05 AM   #966
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Great summary Rowemeister! Nice one.

Looking at the CD17 schematic, can I assume that, like the DAC in the cd63/67, the output is balanced, but this time, going into the HDAM rather than the first opamp stage?


Cheers,
Phil
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Old 24th February 2006, 11:15 AM   #967
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Quote:
Originally posted by philpoole
Great summary Rowemeister! Nice one.

Looking at the CD17 schematic, can I assume that, like the DAC in the cd63/67, the output is balanced, but this time, going into the HDAM rather than the first opamp stage?


Cheers,
Phil
The PCM1716 has built in filter so basicaly the op amp is in the DAC. It uses Burr Brown sound plus technology which is used in the OPA2134 op amp
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Old 24th February 2006, 11:17 AM   #968
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Quote:
Originally posted by ashok
I have a CD17-MkII.
When the machine is in pause mode I get significant noise on my mV meter. However it is not audible. RF trash ? Shouldn't the output be in the mute state ?
Cheers,
Ashok.
I'm sure the CD17 MKII uses different DACs and op amps (NJM2114)

Not sure on mV mate, I would have thought it was zero though
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Old 24th February 2006, 11:40 AM   #969
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If anyone wants some spec on the cd17 mkIII here is a nice pdf.

check out the feet

CD17 MK III pdf
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Old 24th February 2006, 11:56 AM   #970
poynton is offline poynton  United Kingdom
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Default Class A op-amps

Hi.

For those who want to play some more !
I found this on another thread.

" I've tried to bias I/V OPA627 in class A with 8mA (using BC107B as current source).

And... sound improves "

FET would be better than BC107.

Andy
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