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The Warm Audio WA273 is a dual-channel, Class-A microphone preamp designed to provide up to 80 dB of gain for engineers, producers, musicians, and vocalists in mobile-recording rigs and home, project, and commercial studios. It features custom Carnhill transformers and is wired and assembled by hand to deliver the sound and functionality of classic British 73-style preamps.

Its inputs include balanced XLR and 1/4 TRS jacks and two front-panel 1/4 TS instrument inputs. Input impedance, polarity, ground lift, and phantom power are switchable. Connect an outboard compressor or equalizer via the 1/4 TS insert send and return jacks. Balanced XLR and 1/4 outputs are fed by output level controls and allow compatibility with most audio interfaces and mixing consoles. The selectable high-pass filter can be set to 50 Hz, 80 Hz, 160 Hz, or 300 Hz for management of unruly bass frequencies.

The WA273 is rack-mountable and occupies 1 RU.

Occupies 1 RU
Dual-channel, Class-A mic preamp wired and assembled by hand
Created through years of R&D, careful reverse-engineering, and countless hours of auditioning
Designed to function and sound like a classic 73-style preamp
Fully discrete, transformer-balanced signal path
Custom Carnhill transformers saturate sweetly when pushed
Tantalum and polystyrene capacitors in the signal path and an output transistor choice that is smooth in high-gain settings
Stepped mic pre gain
Inductor-based selectable high-pass filter
Balanced XLR and 1/4 inputs and outputs
Front-panel 1/4 TS instrument inputs
1/4 TS insert sends and returns
Output controls with 5-segment LED meters