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robert casey
Guest
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 Posted:
Tue Jan 11, 2005 8:07 am Post subject:
Turns out I have my first CD player, but in a different shap |
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My first CD player was a Yamaha CDX2 (IIRC). "Natural
sound 2X oversampling" it proclaimed on the front of
the cabinet. Bought it in 1985, it died in 1990. But
stripped out the boards and transport mechanism for
the scrap junk box. Well, at a flea market I picked
up a "Fisher Studio Standard" AD834. Well, this player
uses nearly the same circuit board and transport (the
part number printed on the board is somewhat different
so there must be some trivial difference). The chips
are all the same, specifically the chips around the DAC.
A Burr Brown PCM53JP-V. Then both separate the left
and right audio with sample and hold circuits in the
audio domain. Well, what can I say, both Yamaha and
whoever it is that bought the Fisher brand name both
cheaped out....
In any event, I don't have to hunt for a Yamaha CD
player on evil bay to listen to my first CD player
as I essentially have it inside the box marked "Fisher"
In the Fisher I added a direct heated triode output
stage. See
http://pw2.netcom.com/~wa2ise/radios/tubedac.htm#dhtdac
though to do it right I'd change the DAC to the
current output instead of the voltage output one there.
Yamaha's cabinet was about 4 inches shorter across
than the Fisher, which is the standard width
across for modern audio boxes.
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A S Goh
Guest
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| Posted:
Tue Jan 11, 2005 8:30 am Post subject:
Re: Turns out I have my first CD player, but in a different |
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Hi Robert
How does it sound? Very sweet and near to analog?
Thank for feedback
Goh A S
"robert casey" <wa2ise@ix.netcom.com> wrote in message
news:MpHEd.3519$KJ2.801@newsread3.news.atl.earthlink.net...
| Quote: | My first CD player was a Yamaha CDX2 (IIRC). "Natural
sound 2X oversampling" it proclaimed on the front of
the cabinet. Bought it in 1985, it died in 1990. But
stripped out the boards and transport mechanism for
the scrap junk box. Well, at a flea market I picked
up a "Fisher Studio Standard" AD834. Well, this player
uses nearly the same circuit board and transport (the
part number printed on the board is somewhat different
so there must be some trivial difference). The chips
are all the same, specifically the chips around the DAC.
A Burr Brown PCM53JP-V. Then both separate the left
and right audio with sample and hold circuits in the
audio domain. Well, what can I say, both Yamaha and
whoever it is that bought the Fisher brand name both
cheaped out....
In any event, I don't have to hunt for a Yamaha CD
player on evil bay to listen to my first CD player
as I essentially have it inside the box marked "Fisher"
In the Fisher I added a direct heated triode output
stage. See
http://pw2.netcom.com/~wa2ise/radios/tubedac.htm#dhtdac
though to do it right I'd change the DAC to the
current output instead of the voltage output one there.
Yamaha's cabinet was about 4 inches shorter across
than the Fisher, which is the standard width
across for modern audio boxes. |
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electron@grapevine.net
Guest
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| Posted:
Tue Jan 11, 2005 6:04 pm Post subject:
Re: Turns out I have my first CD player, but in a different |
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FYI
The Yamaha CDX2 is (was) also identical to the Sherwood CDP-200
A few other early CD brand/model equivalences:
Technics SL-P110 = MCS Model 683-6804
Magnavox CDB570 = Pioneer PD-M50
Yamaha CD-X3 = Yamaha CD-300 = Emerson CD150A = Pulsar LL56667
Technics SL-P7 = Curtis Mathes KP485
....to name a few!
-Robert
QTS
http://www.Braught.com
real email addy : Robert@NoSpamBraught.com (remove NoSpam to reply :
Duh!) |
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Pooh Bear
Guest
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| Posted:
Fri Jan 14, 2005 2:44 am Post subject:
Re: Turns out I have my first CD player, but in a different |
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robert casey wrote:
Entertaining.
That trick with the resistor to supply to improve 741s was popular
around 30 yrs ago.
Modern op-amps are somewhat better.
Was it really worth the bother doing this to a CD player using R-2R DACs
?
Graham |
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Sander deWaal
Guest
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| Posted:
Fri Jan 14, 2005 3:05 am Post subject:
Re: Turns out I have my first CD player, but in a different |
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Pooh Bear <rabbitsfriendsandrelations@hotmail.com> said:
Somewhere on this page there's an experiment to use a grounded grid
stage after the current output of the DAC.
I've tried that extensively with a Pioneer PDS507 , with little
succes.
Couldn't get it to work right, besides it sounded like shit.
Exit grounded grid for me.
I noticed Robert is still working on it, hopefully he has more success
than me.
| Quote: | That trick with the resistor to supply to improve 741s was popular
around 30 yrs ago.
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Even with more modern opamps, it works.
Better yet, a current mirror at the output.
| Quote: | Modern op-amps are somewhat better.
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OPA2604 is a good GP double opamp IMO.
Better not use opamps at all if possible.
My analog DAC stage consists of a class A complementary stage with a
supply voltage of plus and minus 36 volts.
Headroom, anyone? :-)
| Quote: | Was it really worth the bother doing this to a CD player using R-2R DACs
?
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In love and audio, everything is permitted :-)
--
Sander de Waal
" SOA of a KT88? Sufficient. " |
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