Changing SAA7220P/A for P/B version

[zygibajt]

Hi
I just came across nice Philips CD650 player (have never had this one).
This is TDA1541 , SAA7220P/A , SAA7210P
I have some spare TDA and SAA chips.
I know TDA1541 is interchangable for A version.

Now can I just drop SAA7220P/B in place of SAA7220P/A version or I have to change some circuit components?
I'm not sure (used SEARCH but couldn't find it) but I think somebody mentioned something about getting rid of some cap,but I might be wrong.

Also what advantage would bring changing SAA7210P for A version?
Are those direct replacements?

Thanks for your answers

Bartek

[guido]

Hi,

Swapping the componetns for the newer ones should bring improvements, however there is a post here where somebody 'complains' a 650 is better sounding than a newer philips with cd1mk2 7220B and 1541A. So dunno if it is a good idea.

Search for 650 here, there's enough said about this player and what you could do with it.

If you send me a pm for the schematics.

GuidoB

[Bernhard]

Originally posted by zygibajt


I just came across nice Philips CD650 player (have never had this one).
This is TDA1541 , SAA7220P/A , SAA7210P
I have some spare TDA and SAA chips.
I know TDA1541 is interchangable for A version.

Dzien dobre !

Please try TDA1541A and tell me about difference.
Also SAA7220P/B.


Bernhard

[zygibajt]

Thanks for all your kind answers.

I have some expirence in those old Marantz/Philips players but I have never had CD 650.

I have a nice set of Marantz CD 65II (three of them).
One of them is my current player.I'm using it with Kwak Clock 7
and Thorsten's OPA660 I-V.Also it was equipped with CDM 4/19 but I managed to adopt CDM1/MKII to this player (quite a diffrance,probably brushless motor).The main board is probably the same as in higher model that use CDM1/MKII so mounting holes and motor drive are same.Also I have S1 chip in this player.

OK.
I just bought CD650 today,as I said.
This one has CDM2/10 ,pretty much CDM1/MKII but with plastic chassis.Also laser lens looks diffrent (I have to try wheather CDM4/19 is a direct replacement as in case of CDM1/MKII).

I compared it to stock Marantz CD65MKII ,boy that is the diffrance!
Philips is much better.What I did:
I just removed muting transistors.
Put BB2604 OP-AMPs.
Changed TDA1541 for "A" version and I must say it almost matches my modded Marantz.I wonder what makes a diffrance,better grounding ,or PS?
I haven't even exchanged electrolitics caps.

I'm wondering what is the sonic diffrance between TDA1541 and TDA1541A.
Tomorrow I will buy some DIP's and try to switch between them.I will also check sonic diffrance between SAA7220P/A and P/B version.I will report my findings ,soon

Guido I will send you an e-mail asking for schematics.

Bartek

[zygibajt]

Please try TDA1541A and tell me about difference.

TDA1541A sounds indeed better in CD 650.It's smoother,better imaging...etc.

Also S1 version sounds better that plain TDA1541A.

Haven't tried SAA7220P/B yet

Bartek