Here's another NOS 19 update. Still not entirely sure this is the right thread for it, but haven't seen any closer to it than this (w/various people talking about doing NOS mods to their DAC-19's, running their DAC-19's in NOS mode, etc.). So here goes:
Haven't really kept close track, but my NOS 19 is somewhere between 350-400 hrs, maybe a bit more. And it's really shocking how much the sound of it keeps changing, even this late in the lengthy burn-in phase:
-- Just a week or two back, it was suddenly sounding brighter than before (it had sounded terrific for awhile). I became concerned, starting messing w/the phase button. Things got better. But that's now seems like 10 years ago.
~10 days ago I installed a new sub, an SVS SB-1000. It's been burning in for ~100 hrs, so to check it out, I just listened to one of the best studio recordings around, Donald Fagen's MORPH THE CAT, on my speakers + sub.
DAMN! The sub sounds great, but what really shocked me is that the whole system sounds unbelievable. I'm hearing things from this recording I've never heard on this system: the center image utterly clear & defined; the different instruments & effects are extremely clear, but all this detail is non-fatiguing; the tonal quality is as close to analogue as digital can possibly get; and the mid-bass is rich, warm, wet--all those words that mean dimensionality + impact at the same time (most digital cannot do this). In short, the NOS 19 is lighting me up.
Then I plug in my favorite cheap-but-terrific 'phones, the Yenona Adapter-Free DJ headphones, just to see if I'm dreaming this. Nope. The NOS 19 is also nailing it via headphones.
I read in several threads on Head-Fi how long it took the DAC-19 to burn in, how much it changed over hundreds of hours (and by extension, this had to apply to the virtually identical NOS 19). Well, it's all true.
This is an amazing DAC. Listening to music through it, I go for long periods w/o thinking about equipment--just getting lost in sound. It's turning out to be an endgame component for me.