Need Help: Can't recall which hi-end R2R dac had an optional preamp board?

Thanks guys

Yes, it is the Holo Spring

Had an optional pre: MSB Select II, I had one.

Not disputing the others, but can confirm this one.

Holo Audio Spring for sure.

I believe it's the Holo Audio Spring with optional real pre-amp board.

msb

chord

weiss

bricasti

totaldac

dcs

emm

all have line preamp/volume control capability (if limited to no add’l analog line inputs, though plenty of digital ones)

MSB?