This is a Little Dot MK III headphone amp with a variety of tubes to swap in and out. The amp is in very good condition, with a tiny cosmetic blemish on the face plate (I've tried to photograph it, but it's not pronounced enough to come out clearly--I've included the photo anyway). Also included is another 16 or so replacement tubes of various makes: some Sylvanias, a couple of Mullards, some Russian tubes of indeterminate make. All are included in the sale. The instruction manual (including information about switching out tubes) is included.