With WA7tp (tube power supply) upgrade. The Woo Audio WA7 "Fireflies" (2nd Gen) 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 signal path. The D/A converter is designed to be capable of up to 24-bit/384kHz 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, an external 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 outputting up to 1w of power 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.
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