Royer Labs SF-24V Vacuum Tube Stereo Ribbon Microphone

Royer Labs SF-24V Vacuum Tube Stereo Ribbon Microphone

Royer Labs SF-24V Vacuum Tube Stereo Ribbon Microphone

B&H # ROSF24V MFR # SF-24V

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Product Highlights

  • Stereo Ribbon Microphone
  • Twin Tube-Powered Amplifiers
  • Figure-8 Pattern Pickup for Blumlein, MS
  • Military-Grade Vacuum Tubes Employed
  • Dedicated Power Supply
  • -38 dB Output, Suitable for All Preamps
  • Low Self-Noise
  • No Signal Loss Over Long Cable Runs
  • 2 x Transformer-Balanced Outputs
  • Suitable for Orchestras, Drum Kits & More
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Royer Labs SF-24V overview

  • 1Description

Styled in a satin nickel finish, the Royer SF-24V is a true stereo ribbon microphone drawing tonal characteristics from its vacuum tube; indeed, the electronics of the tube elicit a smooth midrange and clarion highs, providing you with an open-sounding sense of air not commonly achievable with ribbon microphones. The microphone is designed to pick up true stereo recordings, allowing for a detailed stereo image and precise transient response.  

With an output level of -38 dB, the SF-24V will work with any pro-audio preamplifier, giving you self-noise lower than 18 dB, which renders the microphone particularly suitable for classical, acoustic, and otherwise naturalistic recording scenarios. Technically the SF-24V is two microphones in one unit, one capsule placed above the other in a coincident pair, with each figure-8 element aimed 45° from center, thereby giving you a classic Blumlein recording field. Each ribbon transducer has been fashioned in such a way as to deliver a uniform and largely flat frequency response at various distances; you’ll find that the coloration usually imparted by capturing audio off-axis from a microphone’s position is largely absent in this microphone.

The microphone provides two amplifiers, each utilizing triode-connected, military-grade 5840 vacuum tubes. Furthermore, triode-configured cathode follower circuitry allows the microphone to operate across long cable runs without noticeable sonic degradation or loss of treble; long cable runs are further ensured by a dedicated power supply. The microphone’s outputs are fully balanced, electrically isolated utilizing Jensen output transformers.

All of this means the SF-24V boasts more output level than non-powered ribbon microphones, while impedance-matching electronics ensures that it’s easier to use this microphone in a safe, nondestructive manner—not necessarily a given with ribbon microphones. Thus, this stereo microphone is quite suitable for full orchestras, choirs, chamber groups, acoustic pianos, drum overheads, and more. Additionally, the phase compatibility between each of the SF-24V’s capsules is such that summing a stereo recording to mono will result in no phase artifacts. Each capsule can also be used in an independent, mono implementation. 

Features at a Glance
  • Vacuum-tube circuitry provides high output and impedance matching
  • True stereophonic recording from one coincident microphone in Blumlein and M-S
  • High SPL capabilities
  • No distortion up to maximum SPL rating
  • Extremely low residual noise
  • Ribbon elements are not affected by heat or humidity
  • Absence of high-frequency phase distortion
  • Equal sensitivity from front or back of elements
  • Consistent frequency response regardless of distance
  • High efficiency, matching toroidal transformers
  • Low magnetic leakage
Suitable Applications
  • Orchestra
  • String Sections
  • Solo Strings
  • Brass and Woodwinds
  • Acoustic Piano
  • Harp
  • Choirs
  • Drum Overheads
  • Percussion Instruments
  • Acoustic Guitars
  • Large & Small Ensembles
  • Ambiance
  • Stereo, Mono, or Stereo to Mono
UPC: 899060002266
In the Box
Royer Labs SF-24V Vacuum Tube Stereo Ribbon Microphone
  • Power Supply
  • Wood Storage Case
  • 5-Pin XLR to Dual 3-Pin XLR Cable (25')
  • Shockmount
  • Limited Lifetime Warranty
  • Limited 1-Year Warranty on Ribbon Element
  • Table of Contents
    • 1Description

    Royer Labs SF-24V specs

    Analog Performance
    Operating Principle Pressure Gradient
    Transducer Ribbon
    Tube Yes
    Polar Pattern Figure-8
    Frequency Range 30 Hz to 15 kHz
    Equivalent Noise Level 18 dB 
    Maximum SPL 130 dB SPL
    Impedance 450 Ohms @ 1 kHz
    Load Impedance 1.5 kOhms
    Sensitivity -38 dB
    Operating Current Consumption 4.0 mA
    Length 10.63" / 270 mm
    Diameter 1.54" / 39 mm
    Weight 20.56 oz / 583 g
    Packaging Info
    Package Weight 21.3 lb
    Box Dimensions (LxWxH) 22.7 x 16.6 x 9.3"

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