Warm Audio WA73-EQ Single-Channel British Microphone Preamplifier with EQ
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Description
The Warm Audio WA73-EQ is a single-channel, Class A microphone preamplifier with inductor-based 3-band equalizer, recreating the complete 1073-style British console channel strip. With 80 dB of gain, custom Carnhill UK transformers, and Blore Edwards UK dual-concentric EQ potentiometers, the WA73-EQ delivers preamp warmth and musical EQ shaping in a 1U rack format.
3-Band Inductor EQ
The EQ section features Blore Edwards dual-concentric switch potentiometers manufactured in the UK:
- Low band boost/cut: 35, 60, 110, 220 Hz
- Mid band boost/cut: 360, 700, 1600, 3200, 4800, 7200 Hz
- High band boost/cut: 10, 12, 16 kHz
The high band includes additional frequency points beyond the vintage 1073 for greater flexibility.
Preamp Section
The fully discrete, hand-wired Class A signal path uses custom Carnhill UK input and output transformers. A 22-position resistor-stepped gain switch provides 80 dB of range, while the Tone button toggles input transformer impedance for tonal variation between ribbon-friendly top-end air and the classic punchy British console sound. A four-position inductor-based high-pass filter at 50, 80, 160, and 300 Hz handles low-frequency cleanup. XLR mic input, TRS line input, TS instrument input, and balanced send/return inserts provide flexible connectivity, with 48V phantom power, polarity inversion, and ground lift.
Specifications
- Type: Single-channel, Class A, 1073-style British mic/line/instrument preamp with 3-band EQ
- Topology: Fully discrete, hand-wired, hand-assembled
- Transformers: Carnhill UK (input and output)
- EQ potentiometers: Blore Edwards UK (dual-concentric)
- Gain: 80 dB (resistor-stepped)
- High-pass filter: 4-position (50, 80, 160, 300 Hz)
- Phantom power: +48V
- Polarity switch: Yes
- Ground lift: Yes
- Inputs: XLR mic, TRS line, TS instrument, TS insert send/return
- Outputs: XLR, TRS
- Frequency response: 20 Hz - 20 kHz (+/- 0.5 dB)
- Power: 115/230V, internal IEC
- Dimensions: 483 x 44 x 254 mm (19.0 x 1.8 x 10.0")
- Weight: 5 kg (11 lb)
- Rack size: 1U, 19"
In the Box
- Warm Audio WA73-EQ
- IEC power cable