Woo Audio WA7 Fireflies Tube Headphone Amplifier with DAC - Generation 3 - Black

Woo Audio WA7 Fireflies Tube Headphone Amplifier with DAC – Generation 3 – Black

What You Need to Know

The Most Beautiful Way to Hear Tubes

The Woo Audio WA7 Fireflies Tube Headphone Amplifier with DAC is as captivating to look at as it is to hear. Beneath its signature crystal-glass top, two glowing vacuum tubes drive a pure Class A, transformer-coupled amplifier—with no semiconductors anywhere in the signal path. Designed and assembled in New York, the third-generation WA7 pairs that all-tube warmth with a modern ESS SABRE DAC in one seamless cube.

Plug in your computer, plug in your headphones, and let the fireflies glow.

Pure Class A Tube Amplification

The WA7’s signal path is genuinely all-tube: a pair of 12AU7 dual-triodes feed nickel-alloy-core output transformers in a single-ended Class A design. The result is the sound tube lovers chase—rich harmonic texture, natural warmth, and effortless musicality—delivered with more than 1.5 watts per channel, enough to drive headphones from sensitive IEMs to demanding planars (8 to 600 ohms).

The self-biasing 12AU7s are also among the most affordable, widely available tubes to roll, making the WA7 an easy amp to customize.

Built-In ESS SABRE DAC

The integrated DAC uses an ESS SABRE converter with an XMOS asynchronous USB interface, playing PCM up to 24-bit/384kHz and DSD up to DSD256. It’s plug-and-play with Mac and Windows, works with iOS and Android, and is Roon compatible—perfect for lossless streaming from Tidal, Qobuz, or Apple Music.

An RCA analog input welcomes your CD player, streamer, or phono stage too.

Balanced Output and Preamp Function—New for Gen 3

The third generation adds a genuine Pentaconn 4.4mm balanced headphone output alongside the ¼-inch jack, plus switchable rear preamp outputs (4.4mm balanced and 3.5mm) that let the WA7 drive powered speakers as a tube preamplifier.

Best of all, the power supply is now built in—one box, one AC cord, no external bricks.

Designed and Assembled in New York

Every WA7 is built by Woo Audio in New York, USA—a family company hand-crafting tube amplifiers since 2004—and backed by a 3-year warranty.

Building Your System

Set the WA7 on your desk, connect your computer by USB (cables included), and enjoy. Its 8–600 ohm drive range covers virtually every headphone, and the preamp outputs make it the heart of a compact desktop system with powered monitors.

The glass top lifts off for tube rolling—upgrade tubes are available whenever curiosity strikes.

Features & Specifications

Pure Class A, All-Tube Signal Path
Two 12AU7 tubes, transformer-coupled—no semiconductors in the signal path.

Signature “Fireflies” Glass Top
A thick crystal-glass block showcases the glowing tubes.

ESS SABRE DAC with XMOS USB
24-bit/384kHz PCM and DSD playback, plug-and-play on Mac and Windows.

Balanced 4.4mm and ¼-Inch Outputs
Over 1.5 watts per channel drives headphones from 8 to 600 ohms.

Tube Preamp Outputs
Switchable balanced and 3.5mm pre-outs for powered speakers.

Designed and Assembled in New York, USA
Hand-built by Woo Audio and backed by a 3-year warranty.

Specifications

•          Type: Class A Tube Headphone Amplifier / Preamp / USB DAC

•          Tubes: 2 x 12AU7 (5963) Dual-Triode, User-Replaceable

•          Output Power: More than 1.5 Watts per Channel

•          Headphone Outputs: 4.4mm Balanced (Pentaconn), ¼-inch

•          Headphone Impedance Range: 8–600 ohms

•          DAC: ESS SABRE with XMOS Asynchronous USB

•          Playback: PCM up to 24-bit/384kHz; DSD up to DSD256

•          Inputs: USB Type-B, RCA Analog

•          Preamp Outputs: 4.4mm Balanced, 3.5mm

•          Frequency Response: 10Hz–46kHz (-3dB)

•          Signal-to-Noise: 100dB

•          Power Supply: Internal Linear

•          Dimensions: 4.8“W x 5.25”H x 6"D (with glass)

•          Weight: 8.5 lbs

•          Finish: Midnight Black

•          Warranty: 3 Years

Frequently Asked Questions

Will it drive my headphones?
Almost certainly. With over 1.5 watts per channel and an 8–600 ohm range, the WA7 handles everything from sensitive IEMs to power-hungry planar magnetic headphones.

What’s new in the third generation?
The power supply is now built in (no external box), output power increased to 1.5+ watts, and Woo added the 4.4mm balanced headphone output, preamp outputs, an RCA analog input, and easy-to-roll 12AU7 tubes.

Can I use it as a preamp?
Yes. Switchable rear outputs—4.4mm balanced and 3.5mm—let the WA7 serve as a true tube preamplifier for powered speakers or an amplifier.

Who is the WA7 designed for?
It’s ideal for headphone listeners who want genuine all-tube Class A sound, a quality built-in DAC, and a piece of audio sculpture on the desk—all in one box.

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