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Spring Amp II Desktop Spring Reverb Preamp

SKU eq-1857

100% wet signal šŸ’¦
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Lab Overview


  • hi-fi amplifierĀ for spring reverb tanks that combines studio quality sound response with a 2-pole high pass/low pass filter to shape the springā€™s output
  • works as an interface between standard audio mixers and spring reverb tanks made for guitar amps
  • extra low noise reverb pick up amp with discrete transistors for best achievable noise figure
  • intuitive, hands-on sound shaping w/ individual rotary knobs for adjusting input, output, & analog filter modulation controls
  • features a crossfader between the filtered and unfiltered signal to equalize and shape output
  • modulation select button, choice between triangular LFO or Sample & Hold mode
  • in S&H mode the filterā€™s cutoff frequency gets randomly changed when triggered by the input signalā€™s peaks
  • works with external spring tanks & is compatible with most tanks on the market (see below for list of compatible tanks okay'd by Benidub)
  • power supply + RCA cables included

"A bridge between audio mixers and spring reverb tanks the SPRING AMP II works as an interface to bridge the gap between standard audio mixers and spring reverb tanks, providing deep filtering and wide dynamics control of the spring's output at extra low noise. This unit is empowered with a filter inspired by our most beloved synths, with its LFO modulation integrated in an intuitive and extremely playable interface design." - Benidub


  • input (1) 1/4" balanced/unbalanced mono Jack
  • output (1)Ā 1/4" balanced/unbalancedĀ monoĀ Jack
  • 7.5W constant current amplifier
  • inbuilt 12DB/OCT resonant HP/LP VCF
  • dimensions: 4.7ā€ x 5.9ā€ x 2.4ā€ / 120 x 150 x 60mm

Compatible Spring Tanks + Product Codes

  • type 9 longĀ chassis x3 springs (short, medium, long decay)Ā Ā 9AB1C1B, 9AB2C1B, 9AB3C1B
  • type 8 short chassis x3 springsĀ Ā 8AB1C1B, 8AB2C1B, 8AB3C1B
  • type 4 long chassis x2 springsĀ  4AB1C1B, 4AB2C1B, 4AB3C1B


    Review & Q+A


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