Warm Audio WA-47 Large-Diaphragm Tube Condenser Microphone
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Description
The Warm Audio WA-47 is a large-diaphragm tube condenser microphone designed to deliver the tonal characteristics of the classic U47. Nine polar patterns, selectable from the external power supply, provide versatility from close-up vocals to distant room sounds. At its core is a custom K47-style capsule (WA-47-B-80V) with dual gold-sputtered, 6-micron Mylar diaphragms, paired with a JJ 5751 vacuum tube and a TAB-Funkenwerk (AMI) USA output transformer. The result is a smooth, uncompressed high end with strong, warm low frequencies across vocals, acoustic instruments, drums, brass, and strings.
The JJ 5751 vacuum tube is a low-gain, low-noise valve that forces more of the sonic character of the capsule and transformer to be heard, producing the rich midrange warmth and deep bass that defined the original 47-style microphones. The K47-style capsule (WA-47-B-80V) is manufactured in Australia with the same hole pattern and frequency response characteristics as the vintage original, using 6-micron gold-sputtered NOS Mylar on a single-backplate, dual-diaphragm assembly.
The TAB-Funkenwerk (AMI) USA output transformer uses large-core imported German laminations to deliver the creamy top end and full bass that engineers expect from a 47-style microphone. The WA-47 circuit uses WIMA film capacitors, a Solen French capacitor on the output, and a polystyrene coupling capacitor. The 5-meter Gotham GAC-7 seven-pin cable provides reliable, low-noise signal transfer between the microphone and external power supply.
Specifications
- Type: Tube condenser
- Capsule: K47-style (WA-47-B-80V), dual diaphragm, single backplate, 6-micron gold-sputtered NOS Mylar
- Tube: JJ 5751
- Transformer: TAB-Funkenwerk (AMI) USA
- Polar patterns: 9 (cardioid, omni, figure-8 + 6 intermediate)
- Frequency response: 20 Hz to 20 kHz
- Max SPL: 140 dB (<0.5% THD)
- Output impedance: 200 Ohms
- Self-noise: 11 dBA
- S/N ratio: 82 dBA
- Dynamic range: 130 dBA
- Cable: Gotham 5 m GAC-7, 7-pin
- Mic dimensions: 254 x 60 mm (10" x 2.36")
- Total weight: 4.08 kg (9 lb) including PSU, shockmount, and cables
In the Box
- WA-47 microphone
- External power supply with IEC cable
- Shockmount
- Gotham 5 m 7-pin GAC-7 cable
- Wood storage box