The rise of the transistor in the 1950s pushed out poor ol' vacuum tubes from common use, and it's rare to even find any of these glorious glass tubes still in use today. That is, unless you know where to look - and where to listen - for warmer, richer sounds with a steampunk-meets-modern aesthetic.
Meet the Bravo Audio Ocean, a sweet little tube amplifier designed for high-impedance headphones, encased in a beautiful blue aluminum shell. It's a pure Class A tube amp; no integrated-circuit op-amps in here (eat it, transistors!). And it will save you the hassle of carrying adapters: this little guy has both stereo RCA and 3.5mm inputs built in, as well as 6.35mm and 3.5mm headphone jacks. You'll get powerful, more natural sound for any headphones you plug into the Ocean.