Warm Audio WA-MPX Microphone Tube Preamplifier

The WA-MPX features plenty of control over your input, including high- and low-pass filters, polarity selection, switchable +48V phantom, tone control for changing impedance and applying color, and selectable tape saturation to add harmonic distortion and natural compression to your signals. The custom-wound, large-core CineMag transformer provides reliable performance and helps to deliver the vintage-inflected tone sought by so many modern artists, from Mark Ronson and John Mayer, to St. Vincent and Amy Winehouse.

Old School is Now in Session

Injecting legendary tube warmth from one of the most formative eras of music history, the WA-MPX from Warm Audio is an authentic reproduction of the preamp used in the AMPEX 351 tape machine, a history changing microphone pre used by such famed artists as Les Paul, Elvis Presley, Nat King Cole, Roy Orbison, and more. Sporting three warm vacuum tubes (two 12AX7 tubes and one 12AU7), the WA-MPX delivers up to 90 dB of exceptionally clean gain, including a further 20 dB high-gain boost for low-output sources, and exudes vintage style with its brushed aluminum faceplate and Bakelite-style knobs.

The WA-MPX features plenty of control over your input, including high- and low-pass filters, polarity selection, switchable +48V phantom, tone control for changing impedance and applying color, and selectable tape saturation to add harmonic distortion and natural compression to your signals. The custom-wound, large-core CineMag transformer provides reliable performance and helps to deliver the vintage-inflected tone sought by so many modern artists, from Mark Ronson and John Mayer, to St. Vincent and Amy Winehouse.

Legendary History

Better Than a Plug-In

Control Your Tone

Favored by Artist New and Old

This classic circuit design has driven countless hit-making records from the 50s to the modern era. Steve Albini, a known 351 fan, acquired several 351s in 1996 for use in his world famous Electrical Audio recording studio, and many more modern producers and recording artists have used this equipment to achieve an iconic sound that only a true tube preamp can achieve.

Original AMPEX 351 Artists:

• Les Paul
• Elvis Presley
• Bing Crosby
• Nat King Cole
• Roy Orbison

This sound is also chased by modern artists such as:

• Jack White
• Black Keys
• Amy Winehouse
• Mark Ronson / Bruno Mars
• John Mayer
• The 1975
• St. Vincent
• Arctic Monkeys