Just wanted to let you know this is no ordinary portable headphone amplifier. This design is very unique and has a warm tube like sound. The amp is really quite for IEM's yet powerful enough for large headphones, like Audeze and HifiMan. This is one of our best selling products. Many of our customers use it with the A&K players, which match in size and benefit from a boost in power. The battery life is insane. The look is very "gem" like, machined from a single block of aluminum.
waxdoctorWaxdoctor, you are correct. The Picollo amp uses silicon based triodes, not a tube. We have a different portable amp, the AlgoRhythm Trio, which uses a tube.