Here is a small concept for a Tube Amplifier by Sony. In the world full of electronic sound & IC chips, there are very few passionate music lovers who prefer tube amplifiers. I came to know about this concept while learning about amplifiers for guitar & the paddleboard logics for getting a warm tone. It's true that some things aren't replaceable even they turn out to be vintage! Although the market has tons of plugins & profile amplifiers, this magic of a vacuum tube is irreplaceable.