What are you listening to ?

Don't get me wrong, that amp is very cool, but I cannot hear the difference between inexpensive amplifiers and audiophile gear. If an analog signal is amplified and reproduced correctly, meaning identical waveform and nearly no distortion or noise, then it's the same no matter how much the gear costs or if you use tubes or semiconductors. Warmth, coloring, tube-like sound is really a form of distortion.