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HPA OTL Tube Headphone Amplifier / Preamplifier with USB DAC

Most of us have experienced a situation where on the one hand we felt like listening to our favorite music and enjoying a high-quality, audiophile sound and on the other hand we struggled not to bother anyone around us or not being disrupted by activities surrounding us. In this case, it seems that more and more are considering choosing headphones as the best way to go. Having that in our mind, Lab12 started designing a headphone amplifier, which would offer the desired sound, regardless of the quality of your headphones. It would upgrade your sound experience no matter if you use a cheap or a high quality, expensive pair of headphones.

And since Lab12 are into tubes, what else could be most suitable from offering a full tube OTL headphone amplifier?
First of all, you can use it as a great audiophile preamplifier to connect your power amp of your system.

And what else can you do?
HPA offers two analog inputs and one direct usb input, so you can potentially connect almost any device….

In other words, you have a headphone amplifier and a DAC in the same device! Just connect your laptop and your headphones and enjoy your music collection without compromising the audiophile sound. OTL design offers a wide realistic sound regardless the type of music you prefer.

As every LAB12 device, the full tube OTL headphone amplifier is a solid, fully handcrafted device with luxury, metal paint finishing. We want you to enjoy what you see as much as what you hear. That’s why HPA have this great success and anyone who had the chance to listen to it, even for a while, just loved it.


  • OTL tube headphone amplifier
  • 3x 6N1P tubes (matched output pair)
  • Blue Velvet ALPS Potentiometer
  • Handcrafted audio grade transformer
  • Special Audio Grade parts in every stage
  • Five seperate regulated Power Supplies
  • SRSG® implementation
  • Gold plated Teflon rca connectors
  • Gold plated tube sockets
  • Analog retro nissei VU meter
  • 5mm Aluminum face panel with luxury painting
  • 2 analog, RCA line inputs
  • 1 analog RCA line Preamp output
  • 1 USB input
  • Coaxial output (from USB input)
  • 5mm Aluminum face panel with luxury painting
  • Five Years Guarantee


  • Power: 230/240 Vac 50Hz (1A fused)
  • Power consumption: 70 VA
  • Input impedance: 50K ohm
  • Output impedance: 32-600 ohm
  • Frequency response: 5 Hz to 100K Hz (-3dB)
  • Available colors: Matt Black, Pearl White, Custom color
  • Dimension (WxHxD): 32x11x29 cm
  • Weight: 6 Kg
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