Which good discrete R2R multibit DAC & why NOS ?

US-based Mojo Audio makes R2R NOS dacs.  Their Mystique V3 has won a few awards.  It uses the 20-bit, AD1862 R2R chips.  They have dacs from $2500-7500.

I thought I had read somewhere that the Reimyo DAP 777 used PCM63's, but now can't find anything on it.   I sometimes look for old dacs that have that chip, and I remember the Reimyo being on my mental list.

Yes Mojo also do good R2R Multibit dacs now.
They wrote a great article a few years ago on DSD vs PCM and the d to a conversion to do each. R2R (multibit) vs Delta Sigma (single bit)  Here's what they said.

When a PCM file is played on a native DSD single-bit converter, the single-bit DAC chip has to convert the PCM to DSD in real-time. This is one of the major reasons people claim DSD sounds better than PCM, when in fact, it is just that the chip in most modern single-bit DACs do a poor job of decoding PCM.

https://www.mojo-audio.com/blog/dsd-vs-pcm-myth-vs-truth/

Cheers George

@veroguy  

https://www.ebay.com/itm/202167842535

I use this seller's AD1865 DAC and I really like it. I would like to know what the PCM63 DAC sounds like. 

The link below is for a PCM56P-K DAC that I'm also considering just for the sake of trying something different. 

https://www.ebay.com/itm/362843900577

Some of the best very expensive Wadia dacs use PCM56 and PCM63 chips in them, with what they called the discrete "Sledgehammer" output boards.
They also had what I found to be the best way to link it to their transports with AT&T glass BNC optical link, using a dab of very expensive "optical indexing fluid" on both ends, so there was no air gaps to the AT&T receivers

And Accuphase used the AD1865 in great numbers their top line expensive dacs also.

Mark Levinson, Linn and Naim were a big user of the (best I felt PCM1704’s) in their top end players and dacs.

Naim got amazing sound from the CD555 and PS555 power supply combo. Even today you won’t get this pairing cheap anywhere. https://www.naimaudio.com/product/cd555

Cheers George

The Reimyo CDP 777 used 2 PCM1704 and Nippon SM5847AF filters and JVC K2 DSP which is why it was a good CD player it wasn’t NOS and made use of good filtering and up sampling which any decent R2R implementation needs to do.