9008 is the 24bit version.

Both the 24 and 32 bit versions are not really conventional current output DACs; they look like a voltage source in series with a 200 Ohms resistor, and have single supply output stages, so the voltage source swings about 1.65V. To get proper IV conversion, you need an stage with a very low input impedance, either by using feedback (like IVY) or with something like a current conveyer (Counterpoint), which will hold the output pin close to 1.65V. Note that the range of output currents for the Sabre DAC is unusually large - nearly 10mA.

I don't think valve devices have enough transconductance, nor a large enough linear current range, to match the properties of this DAC in either configuration.