Specifications :Acoustic Operating Principle: Electrodynamic pressure gradient with vacuum tube electronicsVacuum Tube: JAN mil-spec 5840W pentode e configurationPolar Pattern: Figure-8Generating on aluminum ribbonMagnets: Rare Earth NeodymiumFrequency Response: 30 -15,000 Hz +/- 3dBSensitivity: -36 dB (re. 1v/pa +/- 1 dB)Self-Noise: < 18 dBOutput Impedance: 200 Ohms, balancedRated Load Impedance: 1 K-OhmMaximum SPL: >135dB SPL @ 20 HzPower Requirements: Plate supply: 135 VDC @2ma, Filament supply: 6 VDC@ 150ma from dedicated power supply.Dimensions: 206mm L, 25mm W (8 1/8 " L, 1" W).Weight: 300g (10.9 oz )Finish: Dull Satin Nickel/Matte Black Chrome optional
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