I asked this over in the DAC Amp threads and maybe Gary can answer this:
So let me try this again. Say we had a computer, into the solid state Db Labs dac, then a Dodd tube buffer, and then a 4800A or Cherry Jr., and then 87 db 4 ohm speakers.
Would the input and output impedances, gains, flavors, etc. allow the Dodd to actually control the volume???