The "tube sound" and the "solid state sound" relate to the
distortion spectrum characteristic of these devices when used in a linear amplifier.
In a digital amplifier, the characteristics of the ouput devices, tubes or transistors, are irrelevant because they are full on or full off all of the time. The output devices could be relays if you could find ones that switch fast enough. Any sonic characteristic is the result of the algorithms used to control the output devices.
distortion spectrum characteristic of these devices when used in a linear amplifier.
In a digital amplifier, the characteristics of the ouput devices, tubes or transistors, are irrelevant because they are full on or full off all of the time. The output devices could be relays if you could find ones that switch fast enough. Any sonic characteristic is the result of the algorithms used to control the output devices.