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HA75-DAC Tube Head™ Headphone Amplifier

  • 12AX7 tube drive featuring 100% discrete class-A audio circuitry
  • Variable Focus™ control to simulate listening in a room
  • USB input for high-quality digital audio playback
  • Load impedance selector to optimize for any pair of headphones

The Hafler HA75-DAC is an audiophile tube-based headphone amplifier and USB digital-to-analog converter, with a number of useful and innovative features that excite and enhance the listening experience.

The uncompromising design of this amplifier builds upon the foundation of the original HA-75, which has received praise from many of the ‘golden ears’ of the recording industry for the incredible clarity, warmth, and character provided by its tube-based topology. This same circuitry and 12AX7 tube is employed on the HA75-DAC, with the addition of a USB input for monitoring high-fidelity digital audio up to 192 kHz. Analog inputs are provided via RCA and balanced XLR connectors, and a selector switch on the front of the HA75-DAC allows you to easily switch between analog and digital sources.

A number of additional features allow you to tailor the performance of the HA75-DAC to suit both your listening style and your headphones. The Focus control simulates the experience of listening to speakers in a room, using an active matrix that can be dialed in according to taste. A three-position voicing switch allows you to adapt to the balance of your headphones or the source material by applying a loudness curve or enhancing the bass response; the voicing circuit can also be bypassed for a neutral response. Another exciting addition is the load selector switch, which allows you to tailor the output impedance to match any pair of headphones available.

The chassis of the HA75-DAC is built from 14-gauge steel to block stray magnetic interference, and the back panel features gold-plated RCA connectors to ensure optimal signal transfer. Additional ‘thru’ and ‘tube out’ RCA outputs allow you to use the HA75-DAC to feed another input device, or connect between a preamp and power amplifier to impart the character of the 12AX7 tube.

The HA75-DAC blends superior engineering with powerful user-controlled features to provide an exceptional and unique listening experience, allowing you to enjoy your music like never before.

Dial In

  1. Power
    Activates the device and the 12AX7
  2. Focus Control
    Brings the left and right channels to the center to simulate listening to music with speakers in an open room
  3. Level
    Used to set the headphone output level
  4. Load Ω
    Adjusts the output impedance to optimize performance with any pair of headphones
  5. Phones
    ¼" TRS output for headphones. Works with headphones ranging from 8Ω to 400Ω

Connect

  1. Analog Input
    Selectable RCA or balanced XLR connectors.
  2. Digital Input
    USB Type-B Connection
  3. Thru-put
    Whichever input is selected appears at the thru-put in an unbalanced format
  4. Tube Out
    Add the Tubehead's warm tube character to a signal path between a preamp and power amp
  5. Power
    External power supply included

Specs

Audio Circuit:Discrete class-A with 12AX7 tube
Analog Inputs:Switchable RCA or XLR
Digital Input:USB Type B
Thru-puts:RCA (left/right)
Output:Dual ¼" TRS Headphone
Impedance:Selectable 20 - 400 Ohm
Gain:30 dB
Size:6 ½" (w) x 7 ⅞" (d) x 1 ¾" (h) (165 x 200 x 44mm)
Power:±16V 1600mA external supply
Warranty:3 year, transferable