A great introduction to the world of tube headphone amplifiers, the Little Dot MKII is ideal for pairing with a desktop amp and can also function as a preamp to your speakers. It uses a single-ended push-pull OTL circuit operating in Class A, and delivers plenty of headroom and dynamic impact, along with a touch of tube warmth and tonal richness. While its high voltage swing is best suited for high-impedance headphones, the MKII can be fine-tuned to any cans you have—from 32 ohms all the way up to 600 ohms—using its multiple gain settings. Best of all, you get to experiment with tube rolling to achieve your desired sound signature. At the factory jumper setting, this amp can roll 6JI, WE403A/B, GE5654, M8100, CV4010, EF95, and other tubes. With its jumper pins shortened, you can roll EF92, CV131, and all equivalents and drop-in replacements.