Fet buffer (?) for I/V stage ?

[Bernhard]

PD8500 has PCM 63 ?

I bought two PD9300 very cheap.
One had a dead laser and in the other one some electronic died when I adjusted some pots.
The laser moved very fast to the one end and then the transport was dead.

Finally I moved the laser from the player with the dead electronics to the other one and it works fine.

 

[carlosfm]

This is the output stage of the PD-8500

NJM2068DD!
I know them.
They couldn't have chosen better.

 

[Bernhard]

NJM2068DD!
I know them.
They couldn't have chosen better.

Now is this serious ?

Or are they crap ? Never heard of them. Looks like it is exactly the same in my player.

 

[carlosfm]

It would be 2 x 64 =128 as PCM56 is a mono DAC.

Oh, right.

So it looks like I will end up with something like 20 or 30 per channel.

My current stock is around 25

Will that thing beat the Pioneer?

 

[carlosfm]

Now is this serious ?
Or are they crap?

If I'm ing, I feel like killing myself.

Never heard of them. Looks like it is exactly the same in my player.

I had an old Nad amp (7000 Monitor Series receiver) that had these on the preamp.
It's hard to do worse than this.

 

[Bernhard]

Will that thing beat the Pioneer?

As written before I even did not listen to the pioneer.

Spectrum analyzer told me that noise is 6dB better in the Pioneer, due to two more bits, but harmonics are worse, the best of my PCM56 are 6 dB better than the best of my PCM58.

But maybe this has to do with the oversampling filter, I will test again in external circuitry before putting the PD9300 on ebay.

I am afraid that higher bit dac are only better on paper because it is very difficult to manufacture even 16 chips bit with accuracy.

The data sheets always say that monotonocity and DC characteristics can not be garanteed.

 

[carlosfm]

I am afraid that higher bit dac are only better on paper because it is very difficult to manufacture even 16 chips bit with accuracy.

You will eventually find out sooner or later that for CD, the best Dac you can use is the TDA1541A.
You are buying the wrong CDPs...

 

[jean-paul]

One had a dead laser and in the other one some electronic died when I adjusted some pots.

Please do not adjust my cdplayers like that If they simply work OK you better leave them unadjusted.

As written before I even did not listen to the pioneer.

Why listen if you can measure ?

I am afraid that higher bit dacs are only better on paper because it is very difficult to manufacture even 16 bit chips with accuracy.

Finally, enlightment !

CarlosFM, maybe NJM2068DD can end lowest on our Worse Opamp 100 chart !

 

[carlosfm]

Finally, enlightment !

CarlosFM, maybe NJM2068DD can end lowest on our Worse Opamp 100 chart !

100 is not enough.

 

[rfbrw]

bought it for the PCM58-K.

Do you have enough storage space for all the dead CD players you will have to collect?
As TI list the PCM56, all grades, as current why not just buy some. The '56 may well be better than the '58.

 

[jean-paul]

Or PCM63P-K, when it has to sound and measure good. They are still around and not too expensive.

Or TDA1541A when it has to sound just right.

 

[carlosfm]

As TI list the PCM56, all grades, as current why not just buy some. The '56 may well be better than the '58.

I think they are discontinued.
They are nothing special, anyway.

 

[rfbrw]

I think they are discontinued.
They are nothing special, anyway.

With a click or two you could have confirmed the validity or otherwise of your post. But its only audio,so why bother with accuracy. The PCM56, all grades, is listed as ACTIVE.

 

[till]

The PCM56, all grades, is listed as ACTIVE.

"active" for a diyer, is whats available as free sample

 

[Bernhard]

As TI list the PCM56, all grades, as current why not just buy some. The '56 may well be better than the '58.

Samples ???????????

 

[jean-paul]

But its only audio,so why bother with accuracy.

That is exactly the motto of quite some professional engineers that design the plastic we can buy ( and that we try to improve with patience and some accuracy )...

 

[Bernhard]

You will eventually find out sooner or later that for CD, the best Dac you can use is the TDA1541A.
You are buying the wrong CDPs...

I prefer TDA1541 with no A, like in CD304mkII.

PCM56 and TDA1541 sound very similar to me, PCM is more dry and TDA has more Bass.

But PCM56 measures better + is mono and selection is easier + it needs less external parts and less pcb space, so...

 

[rfbrw]

"active" for a diyer, is whats available as free sample

That is exactly the motto of quite some professional engineers that design the plastic we can buy ( and that we try to improve with patience and some accuracy )...

You miss my point entirely, but as I said its only audio so in the general scheme of things it amounts to precisely nothing.

 

[carlosfm]

With a click or two you could have confirmed the validity or otherwise of your post. But its only audio,so why bother with accuracy. The PCM56, all grades, is listed as ACTIVE.

I said "I think" because I couldn't check it.
I could enter the TI web site, but the search for PCM56 produced a time-out.
I tried several times, but the site didn't move.
There was no way I could confirm.
It may be Bernhard asking for samples.

rfbrw, there is no need to talk like that.
Are you mad with something?
We are having a good conversation here, I think?

 

[carlosfm]

I prefer TDA1541 with no A, like in CD304mkII.

Great, you are going back even more than I expected.