Woo Audio WA7 Fireflies 3rd Generation

Woo Audio WA7 Fireflies 3rd Generation

Woo Audio

Regular price $1,399.00 Sale

Have a question, call us at 212-979-1273

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.


    •    All-tube design (not hybrid)
    •    Class-A, Single-ended Triode transformer-coupled
    •    Improved analog circuit
    •    6C45 x2 driver/power tubes, 12AU7 x2 rectifier tubes for WA7tp tube power supply upgrade
    •    Teflon tube sockets
    •    ESS SABRE Reference DAC (ES9018K2M)
    •    XMOS xCORE-AUDIO asynchronous USB compatible with Mac, PC, Android and iOS devices*
    •    Headphones impedance : 8-600 Ohms
    •    Input impedance: 100 Kilo-Ohms
    •    Hi-res audio playback up to 24-bit/384kHz
    •    Inputs: 1 high-retention USB (Type-B) input, 1 RCA
    •    Outputs: 1 1/4″ and 1 1/8″ headphone outputs, 1 RCA (same connector as the input)
    •    Max output: approx 1 watt @ 32 ohms


    •    Frequency response: 11Hz to 27kHz, +/-0.5dB
    •    Distortion: <0.03%
    •    S/N: 95dB
    •    Power consumption: 25W max
    •    Mains supply: 100-120V, 220-240V, 50/60Hz, user selectable
    •    Finish: Anodized aluminum
    •    DC cord length: 4.25 ft or 1.3 m
    •    Dimension: AMP: 4.8″ L x 4.8″ W x 5.1″ H with glass
PSU: 7″ L x 3.5″ W x 2.2″ H
    •    Weight: AMP – 5.3 lbs / 2.4kg, Glass – 3.3 lbs / 1.5kg
PSU – 2.8 lbs / 1.4kg
WA7tp vacuum tube PS – 9.4 lbs / 4.3kg


    •    Handmade output transformer with Nickel Alloy core
    •    24-Bit, 384kHz high resolution playback
    •    Ultra-low jitter USB 2.0 runs on Asynchronous mode
    •    High and low impedance output facilitated via toggle switch on back panel
    •    Open load protection will automatically engage to prevent the amp from damaging when no headphones are plugged in
    •    Multi-functional switch for USB input, RCA input, and RCA output via D/A.
    •    The RCA connectors can be used either as RCA analog inputs or USB DAC preamp outputs
    •    All-aluminum chassis with no screws visible from any viewing angles
    •    High clarity tube protection glass
    •    Multi-layer military grade PCBs
    •    Driver for Windows Vista/XP/7/8/10
    •    USB Audio Class 2.0 is natively supported by Apple OS