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WA7 Fireflies (2nd gen) Headphone Amplifier/DAC

Woo Audio WA7 Fireflies amplifier
Woo Audio WA7 Fireflies amplifier

WA7 Fireflies (2nd gen) Headphone Amplifier/DAC

from 999.00
  • In stock, ships in 1–2 days
  • Add 3% for international orders

The Woo Audio WA7 “Fireflies” Amp/DAC is a combination of high performance vacuum tube headphone amplifier with a built-in USB Digital-to-Analog Converter. It is a pure tube design, utilizing 6C45 tubes in a class-A, single-ended topology, with transformer coupled outputs. There are no semiconductors used in the entire amplification path. The D/A converter is designed to be capable of up to 24-bit/384k sampling rates. This maintains pure data integrity, which is transmitted via standard high speed USB 2.0 interface operating in asynchronous mode.

The high quality construction features include a pair of Nickel Alloy core output transformers, all-aluminum chassis with no screws visible from any viewing angles, a remote-controlled linear external power supply for amplification circuitries, a custom built toroidal power transformer, and multi-layer military grade PCBs.

The dedicated port for in-ear-monitors carries a full range of volume controls ensuring minimal noise. Despite its incredibly compact size, “Fireflies” is a power-house with the capacity to drive almost any demanding audiophile headphones. To accommodate different system setup needs, “Fireflies” can also be used as a stand-alone D-A Converter.

 Shown with WA7tp upgrade.

Shown with WA7tp upgrade.

  • Updated to 2nd generation in March 2016
  • Tubes: 6C45 driver/power 2, 12AU7 rectifier x 2 with WA7tp upgrade
  • Polytetrafluoroethylene (PTFE) tube sockets
  • Singled-ended Triode, Class-A, Transformer-coupled
  • ESS SABRE 24 bit, 384kHz DAC
  • XMOS xCORE-AUDIO asynchronous USB compatible with PC, Mac, Android and iOS devices (with Apple CCK or Android OTG adapter)
  • High-retention USB connector x 1
  • RCA analog Input x 1
  • 1/4" (6.3mm) stereo headphone output (8–600 Ohms)
  • 1/8” (3.5mm) stereo headphone output (for ultra-sensitive IEMs )
  • Linear solid state power supply OR upgrade to WA7tp (tube power supply)
  • Anodized aluminum chassis, available in black or silver
  • Self-biasing with compatible tubes [chart]
  • Dimensions: WA7 amp with glass: 5 ¼" (H) x 4.8" (W) x 6" (D) 8.6 lbs. with glass, Solid state power supply: 2.2" (H) x 3.5" W x 7" (D) 2.8 lbs., WA7tp with glass: 5 ¼" (H) x 4.8" (W) x 6" (D) 9.4 lbs.
  • Global voltage (100v–240v) without converter


 Shown with WA7tp upgrade. *Specifications and appearance are subject to change for improvement without notice.

Shown with WA7tp upgrade. *Specifications and appearance are subject to change for improvement without notice.

  • Quick start guide
  • WA7 Fireflies x 1
  • SOVTEK 6C45 vacuum tube x 2
  • Anti-slip glass pads x 4
  • Solid state power supply x 1 with 4ft. DC cord x 1 [not included, replaced by WA7tp with upgrade]
  • Standard USB A to B cable x 1
  • U.S. style AC power cord


  • WA7tp (tube power supply) x 1 with 1ft. DC cord x 1
  • 12AU7 / 5963 vacuum tube x 2

*Audio cables are not included. 

In the box


Amplifier Tube Upgrade (WA7)


Power Supply Tube Upgrade 1 (WA7tp)

Power Supply Tube Upgrade 2 (WA7tp)

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