Biggest issue is tube preamp running into a digital amp, something with input impedance of 10K or less.
In that case the highs are frequently rolled off because the load is too low for the tube output. The problem is made worse if you are using two sets of outputs from the tube preamp, say for home theater or to drive a separate sub woofer.
Many tube amps (VTL for example) have an input impedance of 150K which works fine for both solid state and tube preamp designs.
In that case the highs are frequently rolled off because the load is too low for the tube output. The problem is made worse if you are using two sets of outputs from the tube preamp, say for home theater or to drive a separate sub woofer.
Many tube amps (VTL for example) have an input impedance of 150K which works fine for both solid state and tube preamp designs.