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Radial Engineering


Radial PowerTube 500 Series Tube Preamp module


The Radial PowerTube is an 'old school' 100% discrete class-A vacuum tube microphone amplifier intended to capture the essence of the voice or instrument while adding the rich harmonics, warmth, and character of a transformer coupled tube circuit.

    • Radial PowerTube PRODUCT FEATURES:

      • High voltage 12AX7 tube drive with 60dB of gain
      • Smooth sounding Jensen Transformer input
      • Hand inserted 100% discrete class-A electronics
      • Single wide module fits all 500 series rack formats

      Specifications are subject to change without notice.
      *Refers to use with Radial Workhorse rack and mixer
      Microphone Input  
      Circuit type:  100% discrete class A with 12AX7 tube drive 
      Microphone Input: Transformer coupled, Jensen JT-115KE
      Current draw: 235mA
      Frequency response: 20Hz ~ 20KHz +0/-1dB
      Input Impedance: 900Ω
      Mic preamp gain: +60dB
      Maximum gain: +75dB when used with Workhorse*
      Maximum output: +22dBu
      Output impedance: 200Ω
      Output type: 100% discrete Class-A FET
      Common mode rejection (CMRR): >84dB
      Equivalent Input Noise (EIN): -128dBu @ maximum gain
      Dynamic range: >93dB
      Total Harmonic Distortion (THD+N): 0.05%
      Intermodulation distortion (IMD): 0.011%
      Instrument Input  
      Omniport input Impedance: 150kΩ, unbalanced*
      Instrument preamp gain: +55dB, unbalanced*
      Equivalent Input Noise (EIN): -95dBu, unbalanced*
      Total Harmonic Distortion (THD+N): 0.1%
      Control Panel  
      Meter: 10 segment peak indicator with hold
      Pad: Variable
      Polarity: 180°
      High-pass filter: 250Hz cut-off, -3dB at 150Hz
      Air Control: Presence boost @5kHz
      Phantom power: 48VDC - 10mA (as supplied by 500 frame)
      XLR configuration: AES spec: pin-1 ground, pin-2 (+), pin-3 (-)
      Ground lift (rear panel): Lifts ground on front panel XLR input only
      Weight: 1.5lbs (0.7Kg)
      Shipping size: 9 x 6.5 x 2 (inches)
      Compliance (API): Yes
      Compliance (WHOS-Doc): Yes
      Warranty: 3 years, transferable
      Conditions: For use in dry locations only between 5°C and 40°C
    • Radial PowerTube SYSTEM REQUIREMENTS:

      500 Series compatible rack that meets power requirements.
Need more info on the Radial PowerTube? Click HERE for the manufacturer's website >>>