The legendary ‘73-style preamp has shaped the sound of countless hit records, earning its place as the “Holy Grail” among professional engineers worldwide. Warm Audio’s WA273 represents years of meticulous research and development, carefully reverse-engineering the coveted British designs that defined pop and rock music for decades. This dual-channel preamp pays genuine homage to vintage audio history, capturing the unique tone and sweet character that made the original units so sought after in recording studios globally.
Built as both a boutique “Desert Island” preamp and a reliable studio workhorse, the WA273 excels across all microphone types – from condensers and dynamics to ribbons. Its versatility shines through on vocals, acoustic and electric guitars, bass, drums, percussion, orchestras, keyboards, and even complete mix processing. With 80dB of gain and a fully discrete Carnhill Transformer balanced signal path, this preamp handles any recording, mixing or engineering challenge with remarkable capability.
The heart of the WA273 lies in its authentic components, particularly the custom Carnhill transformers designed in collaboration with the renowned Cambridgeshire manufacturer. These faithful reproductions of the most coveted early-version transformers deliver that fluid, forgiving saturation that has moved engineers to tears when hearing their mixes. Combined with carefully selected tantalum and polystyrene capacitors in the signal path, plus output transistors chosen for smoother high-gain performance, every element maintains integrity to the original British designs.
True to vintage tradition, the WA273 is entirely hand-wired and hand-assembled, with even PCB components populated manually. This artisanal approach contributes significantly to achieving that sought-after classic British tone, ensuring each unit meets the exacting standards that made the original ‘73-style preamps legendary among audio professionals.
- Dual channel, Class A, '73-style British microphone preamp
- UK made Carnhill transformers
- Hand wired, hand assembled
- 80db of gain - resistor stepped gain switch
- Fully discrete
- Tone button - changes input transformer impedance for varying tone
- Polarity switch
- 48v phantom power
- 4 position inductor based hipass filter - 50, 80, 160, 300 Hz
- XLR mic input
- Line level TRS input
- TS send/receive insert jacks
- XLR & TRS line level outputs
- Direct in, instrument input
- Freq response 20hz - 20khz +/-.5 dB
- 19" rackmountable
- Internal IEC 115v/230v power inlet



