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Which good discrete R2R multibit DAC & why NOS ?

In another thread concerning upsampling and upconversion in servers, mention was made by georgehifi :
¨Should just have a good listen to Redbook 16/44 PCM converted through a "good" discrete R2R Multibit nos dac.¨
Which would these be and why NOS ? Are there no R2R multibit DACs being made today ?
My Reimyo CDP777 although quite old has the K2 conversion and being one-box and top-loading made sense  to me at the time of purchase.
Most importantly, would adding an external R2R bring a noticible improvement or just be sidestepping ?

Thanks in advance

rost

Showing 3 responses by rost

rost OP
91 posts
 
Please enlighten:

@georgehifi 
"But I can’t find what the Reimyo uses for dac chips, my guess would be the R2R PCM1704K’s, I don’t think it’s discrete R2R"
What is the difference between a discrete R2R & non discete R2R DAC ?

@djones51
" it wasn’t NOS and made use of good filtering and up sampling which any decent R2R implementation needs to do."
Please explain further, I thought R2R implied NOS or upsampling.

Thanks


rost OP
91 posts
 
Thanks jond for the clarification on NOS.
Should have deducted as much considering context.
rost OP
91 posts
 
Thanks George for that informative list.

Thank you also Lalitk 
Your views echo my concerns as to how much of an improvement, if any, an external DAC plus the added cable expense would make.
As of yet, no immediate plans to get into streaming, too many lps & cds.
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