Bravo Audio V2 Class A 12AU7 Tube Multi-Hybrid Headphone Amplifier : Amazon.ca: Electronics
La reducere! Bravo Audio V2 Tub Amplificator Upgrade Clasa Un Ecc82 Tub Multi-hibrid Amplificator Pentru Căști \ Portable Audio & Video - Detailingexpert.ro
Here's a tiny, super-affordable, powerful tube headphone amplifier - CNET