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.
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.
An externally hosted image should be here but it was not working when we last tested it.
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
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, 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.
Bernhard said:
Why ? A cdplayer does not necessarily need 2 layer pcb, 18 supplies etc. to sound reasonably good. If the guy likes it he can modify it as long as he wants. Good learning subject, better make a mistake in this 10 euro cdplayer than in a high end model.
It would not be my choice either but if somebody has one and wants to change it why bug him/her with a judgement ?? Of course there are better machines out there but I think Helios999 knows that as well.
Helios999, I can not really advise you on which one to buy as I have several oldies ( to avoid choosing
).jean-paul said:
Why ? A cdplayer does not necessarily need 2 layer pcb, 18 supplies etc. to sound reasonably good. If the guy likes it he can modify it as long as he wants. Good learning subject, better make a mistake in this 10 euro cdplayer than in a high end model.
It would not be my choice either but if somebody has one and wants to change it why bug him/her with a judgement ?? Of course there are better machines out there but I think Helios999 knows that as well.
Helios999, I can not really advise you on which one to buy as I have several oldies ( to avoid choosing
Hi
I agree with JP. I recently modded a 614 (similar) by changing clock (direct clock the 1543 !), opamps (2132), rectifier diods to BYV10-60 and some supply decoupling measures (yes te single layer is messy but with the right (common) sense improvement can be made quite well.
The result is a fine machine, not top of the range in authority but definetely one that I can live with.
Ofcourse my TEAC / DAC combo is way better but if you count the euro's invested......
cheers
one could buy a 820 or 830 for 20$
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