Yes, the Tube DAC II Mk3 has a preamp section and volume control that can be in or out of the circuit.
For me, the Mk2 was unacceptable because the AES digital input is limited to 48 kHz sampling rates, and AES is my principal digital format.
Beyond that, I'm not sure what differences there are between Mk2 and Mk3. Now Mk3 does have a USB input and does handle DSD64—not sure if those are important for you or if the Mk2 offers them...
Odd that I have not yet managed to find a single review of the Mk3. . .