A few words on the new Model NM24:

It's  three units in one package:
a tube DAC
a solid state DAC
a tube Line Amp.

You may evaluate the sound of the Solid State DAC by
feeding its output (the Upper Analog out
terminals on the rear panel, see picture) back
into M24's Line In, either directly with
a good (short) RCA interconnect, or better still,
through a coupling transformer (more on this later)

Then you can instantly compare the difference of
the Solid State DAC and the Tube  DAC by
pushing the button next to the volume control.
The Solid State version is designed to yield a slightly lower level.
It can of course be used with other Line Amps.