Royer SF-24V: Vacuum Tube Stereo Ribbon Microphone

The Royer SF-24V stands as the pinnacle of the SF-series stereo microphones, incorporating vacuum tube electronics for a lush, smooth, and natural sound reproduction. With outstanding stereo imaging, superb transient response, and an unprecedented level of airiness, the SF-24V caters to audio enthusiasts seeking the utmost in stereo ribbon microphone technology. Drawing inspiration from the TEC Award-winning R-122V ribbon microphones, the SF-24V combines top-notch tube electronics with a coincident pair of ribbon microphones for a superior recording experience.

The Royer SF-24V delivers unparalleled stereo ribbon microphone performance, making it a top choice for discerning audio professionals and recording enthusiasts. With its vacuum tube electronics, precise engineering, and versatile recording capabilities, the SF-24V sets a new standard for stereo ribbon miking.

Key Features

• Vacuum Tube Electronics: Twin head amplifiers featuring low-noise, triode-connected military-grade 5840 vacuum tubes increase midrange reach, clarity, and detail.
• Coincident Pair in Blumlein Configuration: Two matched ribbon microphones arranged in a Blumlein configuration for superior stereo imaging.
• 1.8-Micron Ribbons: Dual 1.8-micron ribbons provide excellent transient response and uniform frequency response.
• Magnet/Pole Piece Structures: Consistent frequency response ensured by specialized magnet/pole piece structures.
• Dedicated Power Supply: Enhances microphone performance by providing ample current to the vacuum tube electronics.
• Fully Balanced Outputs: Special-purpose Jensen output transformers virtually eliminate induced noise.
• Large Toroidal Transformers: Specially wound toroidal transformers provide increased sensitivity without adding noise.
• Low Self-Noise: Ultra-quiet operation with self-noise lower than 18 dB, ideal for sensitive applications.

Recording Applications

• Full Orchestra, Choir, and Ensembles: Captures large musical groups with exceptional detail and stereo imaging.
• Classical Piano: Ideal for recording with richness and natural sound reproduction.
• Drum Overheads: Provides realistic stereo imaging and powerful drum tracks.
• Acoustic Instruments: Clear and detailed recording of a variety of acoustic instruments.
• Vocal Groups: Natural and immersive sound capture for vocal ensembles and choirs.
• Room Mic: Effective in capturing the ambiance and depth of the recording environment.

• Acoustic Operating Principle: Electrodynamic pressure gradient with vacuum tube electronics.
• Vacuum Tube: JAN mil-spec 5840W pentode wired in triode configuration.
• Polar Pattern: Crossed figure-8’s.
• Generating Element: 1.8-micron aluminum ribbon.
• Frequency Response: 30-15,000 Hz +/- 3dB.
• Sensitivity: -38 dB (re. 1v/pa +/-1dB).
• Self-Noise: < 18 dB.
• Output Impedance: 450 Ohms @ 1K.
• Recommended Load Impedance: 1500 Ohms or greater.
• Maximum SPL: >130dB.
• Microphone Output Connector: Male XLR 7 pin (stereo*).
• Power Supply Output Connectors: Two Male XLR-3 pin.
• Power Requirements: Plate supply: 135 VDC @2ma, Filament supply: 6 VDC@ 150ma from dedicated power supply.
• Supply Current: 4 mA per channel.
• Microphone Dimensions: 270mm X 39mm (base) X 25mm (top) (10 5/8″X 1.5″ X 1″).
• Weight: 583 grams (20.5 oz).
• Finish: Dull Satin Nickel, Optical Black finish optional.