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Item # 107610784

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Royer SF-24V Vacuum Tube Stereo Ribbon Microphone
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      Royer SF-24V Vacuum Tube Stereo Ribbon Microphone (107610784)
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Top of the Royer SF-series of ribbon microphones.

The SF-24V vacuum tube stereo ribbon microphone is the pinnacle of Royer's SF-series stereo microphones. The sound pickup is lush, smooth and natural, with outstanding stereo imaging and superb transient response. The tube electronics provide increased midrange reach, unmatched clarity and detail, and an airiness previously unheard of in ribbon mics. Utilizing the same proprietary tube electronics as in our TEC Award winning R-122V ribbon microphones, the SF-24V delivers the ultimate in stereo ribbon miking for the true connoisseur of recorded sound.

The SF-24V’s independent tube circuits provide an output level of -38 dB, suitable for use with any professional preamplifier. With self-noise of lower than 18 dB, the SF-24V’s ultra-quiet operation is suitable for the most demanding classical and acoustic recording applications.

Like an SF-12, the SF-24V is actually two matched ribbon microphones, placed one above the other in a coincident pair, each aimed 45 degrees from center in the classic Blumlein configuration. The magnet/pole piece structure of each ribbon transducer delivers a wide, uniform frequency response with no substantial peaks or dips, and the 1.8-micron ribbons produce superb transient response. Frequency response is excellent regardless of the angle of sound striking the ribbons and off-axis coloration is negligible.

The Electronics
The SF-24V’s twin head amplifiers consist of low-noise, triode-connected military grade 5840 vacuum tubes. Designed for a wide range of applications, the SF-24V delivers -38 dB output and the drive capabilities only vacuum tube head amplifiers can provide. The circuits are devoid of typical vacuum tube coloration.

The SF-24V’s triode-configured cathode follower circuitry enables the microphone to drive long cable runs without sonic degradation or high-frequency loss. This capability is further enhanced by the SF-24V's dedicated power supply, which provides ample current to the vacuum tube electronics. Induced noise is virtually eliminated by the microphone's fully balanced outputs, which are electrically isolated with special purpose Jensen output transformers.

The SF-24V has far more level than non-powered ribbon microphones and its impedance matching circuitry places a perfect load on the ribbon element at all times. This allows the use of a wide variety of mic preamps without concern for gain and impedance matches, two critical issues with ribbon microphones. In addition, the microphone’s electronics shield the ribbon elements from any possibility of damage by phantom power, electrical glitches or miswired cables.

It is important to note that the SF-24V’s higher sensitivity creates no additional self-noise. All of the SF-24V’s increased level comes from its large, specially wound toroidal transformers, so there is no additional noise associated with the microphone's higher output. The tube system operates at less than unity, adding no noise of its own

Royer SF-24V Vacuum Tube Stereo Ribbon Microphone Features:

  • Vacuum tube circuitry provides high output and impedance matching
    True stereophonic (Blumlein and M-S) recording from one coincident microphone
    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
    Very low magnetic leakage


Royer SF-24V Vacuum Tube Stereo Ribbon Microphone Specifications:

  • 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


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