Abbssolute Intuition by Etheraudio. This is thhe Biggest Single Ended Vacuum Tube Audio Amplifier with GM100 onboard. With hefty total weight of 386 kilograms, these 30 Watts per channel at 4 Ohm. Single GM100 valve in pure Class A is used as a power stage for each channel. The cathode of the GM100 tubes is made of extremely pure tungsten. All tubes are hands selected from the lot of 100 tubes.