Warm Audio WA73 1-Channel British Microphone Preamp

The Warm Audio WA73 is a single-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 one front-panel 1/4" TS instrument input. 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 an output level control 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 WA73 is rack-mountable and occupies 1 RU.

Occupies 1 RU

Single-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 input

1/4" TS insert send and return

Output control with 5-segment LED meter