What is The Amp? First and foremost, it’s a 50W Guitar amplifier. The preamp is based around a single 12AX7 running at high voltage in a discrete Class A circuit. The tube preamp reacts with a guitar the same way any tube amplifier does: it generates harmonics and the sweet sounding high fidelity tone that tubes are known for. Along with tube EQ. there is on-board reverb and tremolo effects so that The Amp can be used as a grab and go amplifier. But thats just the beginning of what The Amp can do.