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 32-bit/192k 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.

Fireflies also allows the option of rolling (changing)  tubes  to satisfy all tastes of sound signatures for all audiophiles, it also comes with an upgraded tube power supply unit and a selection of 2 colours, please use the drop down menu on the right to choose your preference and please note that for some upgraded models a longer delivery period might be required,

• Pure Class-A tube headphone amplifier
• Built in 32-Bit, 192K USB Digital-to-Analog Converter 
• Solid state power supply
• Handmade output transformer with Nickel Alloy core
• High and low impedance output facilitated via toggle switch on back panel
• Pure tube design without the use of semi-conductors in the amplification circuitry.
• The RCA connectors can be used either as analog inputs or as D-A outputs
• All-aluminum chassis with no screws visible from any viewing angles
• High clarity tube protection glass
• Option to upgrade power supply to full vacuum tube model 
• Elegant and compact design