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Radial Engineering FIREFLY Tube Direct Box 2-Channel

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Write a review Q&A SKU: TZ-FIREFLY Solotech ID#: 105503
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Sale price $465.00 USD
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Radial Engineering FIREFLY Tube Direct Box 2-Channel

The Firefly™ is a studio quality direct box that combines the clarity and detail of an active DI with a tube drive circuit that provides vintage warmth and pleasing harmonics to any instrument.


  • 12AX7 tube drive and class-A front end
  • Dual inputs with separate gain & remote switching
  • Drag control load correction for optimal tone
  • Variable output connects directly to a PA


  • Audio circuit type: 100% discrete class-A FET with tube drive
  • Number of channels: 1 with A/B input select
  • Frequency response: 20Hz ~ 20kHz
  • Dynamic range: >100dB
  • Gain: 20dB (Maximum)
  • Total harmonic distortion: 0.15% from 20Hz ~ 20kHz
  • Intermodulation Distortion: 0.3%
  • Input Impedance: Drag Off: 3.9 Meg-Ohm | Drag On: Variable 22k ~ 500k
  • Output Impedance: 150Ω
  • Equivalent Input Noise: -101dB
  • Noise: -98dB at unity gain
  • Maximum Input: Variable from -12dB ~ +20dB
  • Construction: 14-gauge steel
  • Size (L x W x D): 5.75" x 8.25" x 1.75" (2.75" with handle) 146mm x 210mm x 45mm (70mm with handle)
  • Weight: 3.95lbs. (1.80kg)
  • Power: 5-pin XLR, +/-16V & 48V, 1600mA
  • Conditions: For use in dry locations only between 5°C and 40°C


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