Little Dot MK III Headphone Tube Amplifier Delivers a smooth, non-fatiguing sound with no hint of dynamic compression or imaging fuzz Adds in user-tweaking options such as two gain switches to delivery maximum compatibility with all headphones, regardless of impedance or sensitivity Wider range of driver tube-rolling, including the EF92, CV131, WE403A/B, 5654, M8100, CV4010, EF95, 6JI as well as all equivalents to these vacuum tubes Power Tubes: 2x Soviet 6H6N