diy philips cd604

helios999 · 21st March 2005, 08:36 AM

where find shematic about philips cd604 ?

what about this old player , can it sound fine after to change the lm833 ( are they the dacs ? )
what are the transistors to remove ( for put away ) of the mute circuit ?

jean-paul · 21st March 2005, 11:46 AM

Please first try Google for discovering what LM833 is.

helios999 · 21st March 2005, 01:20 PM

model LM833N

here

jean-paul · 21st March 2005, 02:00 PM

You can replace them as they're nothing special. It depends on the schematic but OPA2604 can be better in this application. According to many it not good enough compared with more modern types. OPA2132 seems a good overall choice.

There are several threads on opamps here, which one to use is dependant on the application and personal taste. Most newer types are at least better than LM833.

You can remove the Mute transistors but be aware of the plop at power up. I would fit a good low jitter clock and replace electrolytics anyhow.

helios999 · 21st March 2005, 03:10 PM

1 -> out rca
2 ->4560d jrc
3 ->LM833n

6 ->transistor mute ?
7 ->transistor mute ?

have to change the the 4560 ? what about it ?

i don't find the mute transistor !

thanks a lot jean paul

jean-paul · 21st March 2005, 03:25 PM

Replace opamps 7660 and 7661. Muting transistors are 7682,7683, 7780 and 7781. Opamp 7720 is for headphones and only buffers output signal. If you don't use headphones you can leave it out if you wish.

helios999 · 21st March 2005, 04:20 PM

ah i'am damned !

nothing reference are writed on the motherboard !

i try to find shematic

Bernhard · 21st March 2005, 07:53 PM

Very cheap player, 2 regulators only, no double side pcb.

jean-paul · 21st March 2005, 08:02 PM

Helios999 has one and asks what can be changed. But you are right, I have a nearly new CD634 ( amongst others ) of that series that is a lot better designed. It won't help helios999

Helios999, member Remco Stoutjesdijk of the former audio-site Ultranalog sells cds with service manuals of most of the old philips cdplayers for 20 euro. A must-have if you like Philips oldies.

helios999 · 21st March 2005, 09:30 PM

i don't understant this philips motherboard
i tweaked my sony xe300 easily , it sound good but a little hard, and yesterday i bought this philips ( 10€ ) for tweaked too.

too bad , i vill change only the op

21st March 2005, 08:36 AM	#1
helios999 diyAudio Member Join Date: Sep 2004 Location: lille	diy philips cd604 where find shematic about philips cd604 ? what about this old player , can it sound fine after to change the lm833 ( are they the dacs ? ) what are the transistors to remove ( for put away ) of the mute circuit ?

21st March 2005, 11:46 AM	#2
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Please first try Google for discovering what LM833 is. __________________ It's only audio

21st March 2005, 02:00 PM	#4
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	You can replace them as they're nothing special. It depends on the schematic but OPA2604 can be better in this application. According to many it not good enough compared with more modern types. OPA2132 seems a good overall choice. There are several threads on opamps here, which one to use is dependant on the application and personal taste. Most newer types are at least better than LM833. You can remove the Mute transistors but be aware of the plop at power up. I would fit a good low jitter clock and replace electrolytics anyhow. __________________ It's only audio

21st March 2005, 03:25 PM	#6
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Replace opamps 7660 and 7661. Muting transistors are 7682,7683, 7780 and 7781. Opamp 7720 is for headphones and only buffers output signal. If you don't use headphones you can leave it out if you wish. __________________ It's only audio

21st March 2005, 08:02 PM	#9
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: The Netherlands	Helios999 has one and asks what can be changed. But you are right, I have a nearly new CD634 ( amongst others ) of that series that is a lot better designed. It won't help helios999 Helios999, member Remco Stoutjesdijk of the former audio-site Ultranalog sells cds with service manuals of most of the old philips cdplayers for 20 euro. A must-have if you like Philips oldies. __________________ It's only audio


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21st March 2005, 01:20 PM	#3
helios999 diyAudio Member Join Date: Sep 2004 Location: lille	model LM833N here

21st March 2005, 03:10 PM	#5
helios999 diyAudio Member Join Date: Sep 2004 Location: lille	1 -> out rca 2 ->4560d jrc 3 ->LM833n 6 ->transistor mute ? 7 ->transistor mute ? have to change the the 4560 ? what about it ? i don't find the mute transistor ! thanks a lot jean paul

21st March 2005, 04:20 PM	#7
helios999 diyAudio Member Join Date: Sep 2004 Location: lille	ah i'am damned ! nothing reference are writed on the motherboard ! i try to find shematic

21st March 2005, 07:53 PM	#8
Bernhard diyAudio Member Join Date: Apr 2002 Location: Munich	Very cheap player, 2 regulators only, no double side pcb.

21st March 2005, 09:30 PM	#10
helios999 diyAudio Member Join Date: Sep 2004 Location: lille	i don't understant this philips motherboard i tweaked my sony xe300 easily , it sound good but a little hard, and yesterday i bought this philips ( 10€ ) for tweaked too. too bad , i vill change only the op

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