Are "vintage" DAC's worthwhile, or is this a tech that does not age well


Hello,
whether it’s worth looking into old dac such as
Spectral SDR 2000,
Mark Levinson No.35 (36)
or so Sonic Frontiers Sfd-2 Mk2 DAC.

Digital audio is the fasted moving, now improving category out there
Because to this day they have no usb connection or other options.
But is it necessary?
Or is it better to still focus on a truly time-tested sound?

(sorry for my English)
128x128miglos
@antigrunge2  yes but if you have some sort of USB to SPDIF converter between the computer and DAC then it would take care of the jitter. Once that's done, it could go to any DAC chip. Unless I read your post incorrectly.
It was noticeable improvement in SQ streaming Tidal when I switch to Dragonfly Cobalt from Dragonfly Black in my mobile setup.... so DACs sounds differently to me.