PCM63P Vs. PCM67P Differences?

[jholtz]

What are the differences between these two DAC's? Is the PCM67P an older variety?

Thanks for your responses!

Jim

[Bernhard]

PCM67 Advanced 1-Bit BiCMOS Dual 18-Bit DIGITAL-TO-ANALOG CONVERTER

PCM63 multibit (20 bit)

By the way I received a Pioneer PD8500 with PCM63-J from ebay today, sounds nice but low level linearity is not better like average PCM56...

IMHO more than 16 bit is useless, just look what TI (BB) offers as instrumentation DACs.
More than 16 bit is very hard to find, can`t remember a single chip with better resolution...

It seems that it is very difficult to manufacture such thing.

[jholtz]

Thank you! That was a very precise answer to my question and exactly the information I was looking for.

Best regards,

Jim

Originally posted by Bernhard
PCM67 Advanced 1-Bit BiCMOS Dual 18-Bit DIGITAL-TO-ANALOG CONVERTER

PCM63 multibit (20 bit)

By the way I received a Pioneer PD8500 with PCM63-J from ebay today, sounds nice but low level linearity is not better like average PCM56...

IMHO more than 16 bit is useless, just look what TI (BB) offers as instrumentation DACs.
More than 16 bit is very hard to find, can`t remember a single chip with better resolution...

It seems that it is very difficult to manufacture such thing.

[Spartacus]

The PCM67 combines a bit stream DAC and a multibit DAC in order to minimize the problems with each topology.

According to the datasheet, it isn't as good as the PCM63. Whether you'll like it or not is a different matter of course.

[jean-paul]

Originally posted by Bernhard

By the way I received a Pioneer PD8500 with PCM63-J from ebay today, sounds nice but low level linearity is not better like average PCM56...

Hi Bernhard, I enjoyed having a PD-8500 for about 12 to 14 years. This is a wonderful cdplayer but it needs work. This one is especially sensitive for a new clock and the removal of the digital volume IC. The "class A" output FETs can be omitted and of course better opamps should be used as the original ones are the worst they could get at that time.

I removed the J versions and placed new K versions which was quite an improvement ( both in measured low level linearity and in sound quality ). Later I removed the DAC board and used the space for a better clock with separate power supply. The big caps after the regs are chosen too big as you can hear sometimes at power-on ( motorboating ).

Wonderful mechanics, I still miss the machine as you can see.

[Bernhard]

Originally posted by jean-paul


Hi Bernhard, I enjoyed having a PD-8500 for about 12 to 14 years. This is a wonderful cdplayer but it needs work. This one is especially sensitive for a new clock and the removal of the digital volume IC. The "class A" output FETs can be omitted and of course better opamps should be used as the original ones are the worst they could get at that time.

I removed the J versions and placed new K versions which was quite an improvement ( both in measured low level linearity and in sound quality ). Later I removed the DAC board and used the space for a better clock with separate power supply. The big caps after the regs are chosen too big as you can hear sometimes at power-on ( motorboating ).

Wonderful mechanics, I still miss the machine as you can see.

Hi Jean-Paul,

yes, like every CDP, lytic coupling caps should be replaced with foils, but I will not put too much work into the player.*

My conclusion about modding is that in the end it is better to built the whole thing new.

I also have the PD75 with pioneer dac chip that might be bitstream and it got near perfect low level linearity, while it has also fet classA, output electrolytics and digital volume IC.
Also the spectrum of the left channel is very different from the right channel, its the dac chips.

When I get better grade PCM63 I will compare again.

About the mechanics:

*ggg*

The player lost his laser lens on the way to me. I had to glue it.
The headphone pot was broken on arrival. No srews to fix it on the front plate.

/*ggg*

But nice transport.


*There is something on my bench that keeps me away from all other projects, if I get this working... It is what the world is waiting for.

[jean-paul]

Originally posted by Bernhard

My conclusion about modding is that in the end it is better to built the whole thing new.

There is something on my bench that keeps me away from all other projects, if I get this working... It is what the world is waiting for.

I don't share your view on modding as I really was satisfied with the Pioneer for at least 8 years after I modded it. The hours that I put in it were compensated by the enormous time I enjoyed this cdplayer. Too bad the laser died and it was too expensive to replace. To be honest , I think I would never have re-started with TDA and CDM if I still had my Pioneer.

Of course I later found a few new lasers that ressembled the old one. Do you have the number of the laser for me ? I'll check my stock if I have one. The headphone output can be omitted and a small cover can be glued on the front cover. Plus it will sound better because of the removal of several tens centimeter of cable.

Totally out of context and not a reply to you really but ..... the world really is waiting for help for Asia now. I hope a lot of us will give some money to help the people over there.

[Bernhard]

PXT1027-A is written on the foil connecter.

Are you sure the lens is still there ?

[Ruach]

The lens for the PD-8500 is PWY1011.