The Carot One Does Everything
Another product imported by Mike Tang is the Carot One ($399, $370 tax-in show price), which can be used as an integrated amp, preamp, power amp (6Wpc), or headphone amp. It uses a single 6922 tube, with a class-D output section. It's so cute that you want to buy one whether you need it or not. It's pictured here, with my iPhone included to provide a sense of scale.