TDA1541 info

[QSerraTico_Tico]

Eringa Mod

Those purple or pink output polycarbonate caps impart a lot of colouring to the sound.
I don't like the OP42 as IV-converter. Really hate the the temperamental AD811.
CFB opamps sound weird to my ears in the long run but impress on first sight.
YMMV.

 

[tubee]

Polycarbonate is after PIO one of the best plastic caps. But indeed in my 304 i have MKP motor starter caps, quite good.

What is your suggestion as IV/buffer SeraTico?

I have a simple tube stage in mind, with a switching PS from an old pc or so.

Guido: a friend has an 880 with paper SM. Will copy all. But it is allmost the same around dac as my CD640.

Pro of 880: selected dac, epoxy pcb.

cons of 880: NO pcb gnd shield!!!

 

[Zoran]

I moded once CD880
not much,
NOS mode (override 7220...)
recloced I2S,
discreet IV
that was all
it was really good.
I can imagine with clock generator changed to better one...
*
But I had some problems about mute at first.
There was clicking between songs.
So I somehow trace the signal (wo manual...)
from some controler chip and it was worked out.

 

[jnewbold]

I just changed mine to 220nF PPS, which has made a nice difference, but the most profound change was adding a low-noise reg to the SAA7220 filter.

Hi Lee,

What sort of low noise reg did you add to the SAA7220? Where dd you ground it?

Cheers,

Joe

 

[tubee]

I keep the 880 dig OS-sed. The 1541 is not the perfect candidate for Non os

 

[Bernhard]

In this modded player, the transformer directly sits on top of the digital section, maybe not so good.

I never liked the 880...

 

[tubee]

Yes i know you did'nt like 880. Maybe the missing gnd screen is a clue?
I dislike the placement of toroid also in that added IV amp.

The 304mk2 is still performing here. No s1, no b digital filter.

Btw do you still have the Sony TA N7B? I try to repair one.

 

[guido]

Guido: a friend has an 880 with paper SM. Will copy all. But it is allmost the same around dac as my CD640.

printing from a pdf is easier..... (HINT ).

there's an e-mail button.

 

[tubee]

And where is that button

 

[guido]

zoek de

dan 3 centimeter naar links en 1,5 naar boven.....

 

[tubee]

Ach ja natuurlijk Dank je Guido

Ondertussen ook wat gevonden:

http://www.megafileupload.com/en/file/27040/Philips-cd880-pdf.html

(wat lage resolutie)

 

[Thomo]

Hi Lee,

What sort of low noise reg did you add to the SAA7220? Where dd you ground it?

Cheers,

Joe

Hi Joe, it is something pretty similar to the Sulzer regulator. I won't go into too much detail as we're getting a little o/t.

The 1541 is in my Marantz cd94 btw. I know I can change the chip to a 1541a, but is the 7220b the same pinout as the "A" version? Would I get improvements from changing that too?

Cheers, Lee.

 

[tubee]

SAA7220 B or A is the same pinout. B has sligtly better specs, but not sure what it does on sound. There is also a C, for aeronautics/sattelite use, with another filtering curve.

 

[jnewbold]

Hi Joe, it is something pretty similar to the Sulzer regulator. I won't go into too much detail as we're getting a little o/t.

Hi Lee,

Thanks. I'm on a bit of a budget so I'm preparing to try one of those "Rayregulators" with LEDs and "gyrator" from the Marantz CD63/67 megathread.

Don't know about the a or b rating for 7220. My Rotel RCD965X has b version.

I'm considering changing from SAA7232 bitstream DAC to TDA141. All the power supply are already in the CPD so a small(ish) pcb for 1541 and new output stage is all that is required, I think.

Cheers,

Joe

 

[musicomputer]

SAA7220PA is optimised for TDA1541
SAA7220PB is optimised for TDA1541A (R1/S1/S2)

You sometimes come across other combinations: one of my (unmodified) Philips CD473's has SAA7220PA/TDA1541A

 

[musicomputer]

Double post

 

[QSerraTico_Tico]

Polycarbonate is after PIO one of the best plastic caps. But indeed in my 304 i have MKP motor starter caps, quite good.

What is your suggestion as IV/buffer SeraTico?

.....

Polycarbonate caps do a good job curing digititis.

As for the IV I am using the same opamps as in the PrimaLuna Eight IV-upgrade board.

 

[QSerraTico_Tico]

....

As for the IV I am using the same opamps as in the PrimaLuna Eight IV-upgrade board.

Sorry this was not funny of me.
I am using the OP275 as IV-converter and some analog filtering as in the Zanden patent # US6721427.
Note that newer made OP275s sound a bit more bright than older ones.


I for one do not see any need for 100V/us slew rate opamps as in the PrimaLuna upgrade board. NON-OS would relax this spec anyway.

 

[tubee]

I have tried a OP275

Imo NE5532 is better then.

But best results i have with a rather unfamiliar THS4031, a very good sounding IV in heavily modded old cd304mk2

 

[lcsaszar]

I second to tubee with the THS4031. I use it in my Marantz CD94 for my greatest satisfaction. It replaced the OPA627 which was not bad either.