Woo Audio WA-7 Valve Headphone Amp/ DAC

Douglas Hifi


  • Woo Audio WA-7 Valve Headphone Amp/ DAC
  • Woo Audio WA-7 Valve Headphone Amp/ DAC

This product is currently sold out.

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.



"this little amp sounds powerful" - The Audiophiliac

"This is possibly the most linear
DAC and headphone amp I've heard " - Positive Feedback

"the WA7 is practically a steal in terms of
sound quality and physical presentation. " - HP Soundings

"The WA7 is a thing of museum-grade beauty and simplicity." - Ken Rockwell

"WA7 "Fireflies" are fully featured DACs with
world-class vacuum tube amplifiers." - voted the Best DAC by Lifehacker

"The Fireflies is very highly recommended for anyone buying their first,
or even possibly their last, reference amplifier." - Dagogo

"For anyone wanting a high-performance, compact and aesthetically pleasing ...
head-phone audio system, there's no better choice than the WA7." - Tone Audio Valve