Our OTL 6N6P headphone amplifier is a unique, handcrafted product featuring ECC81/12AT7 and 6N6P (NOS) tubes, delivering warm, detailed sound. Choose your driver tube - from JJ to Telefunken or Mullard - to tailor the sound signature. Built almost entirely with Vishay components, it ensures a clean, interference-free signal. Elegant laser-cut steel enclosure. Compatible with a wide range of headphones, including Sennheiser HD600 and AKG K240.