The jewel of Audio Technica’s range of wireless headphones and a huge favourite among the NME team. At £99 they’re the priciest pair of budget headphones on our list; but for that little bit more you get recognisably great sound. Look:. Detailed instructions to build a DIY 12AU7 Vacuum Tube / IRF510 MOSFET Hybrid class-A Headphone Amplifier Project. The Klipsch Heritage Headphone Amplifier exudes quality even before plugging in your…