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GREENCHILD AMPLIFICATION K818 Klon/Tubescreamer Dual Overdrive

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K818 Dual Overdrive

Two Iconic Overdrives in One!

The ultimate hybrid? Only you can be the judge.

The K818 is a dual overdrive preamp bred through and through with classic K-Style and OD-808

DNA. With a wide dynamic range, sweet overdrive, and lowered noise floor, the K818 is well

suited to cover a variety of playing styles and genres; most notably blues-rock!

Notable Features

  • Boosted internal power supply with 30 volts of dynamic headroom (+/- 15V)
  • Two mechanically isolated channels
  • Transparent buffered input/output
  • Soft clipping overdrive
  • Lowered noise floor
  • Series channel stacking with smooth overdrive and sustain

K-Style (Channel #1 = right side)

Legendary K-Style tone with lowered noise floor and softer dynamic clipping. Don’t be afraid to

crank the gain pot fully clockwise (CW)!


  • Gain – Turn CW for symmetrical soft clipping
  • Treble – Classic K-Style treble boost
  • Output – Turn CW to increase output level (dB)

818 (Channel #2 = left side)

Classic OD-808 tone with crunchy overdrive, wider dynamic range, and increased output level.

Feel the difference that 30V of headroom delivers vs a standard 9V supply.


  • Gain – Turn CW for more distortion and sustain
  • Tone – Rotate clockwise to emphasize mids and highs
  • Level – Turn CW to increase output level (dB)


Both channels may be operated in isolation or stacked. Signal path with both channels engaged:

Input -> Channel #1 -> Channel #2 -> Output

Recommended power supply: 9VDC (at least 300mA), center negative.


  • Input Impedance: 1M ohm
  • Output Impedance: 600 ohm
  • Power Connector: DC center negative, 2.1mm x 5.5mm
  • Current Draw: 270ma (max)
  • Operating Voltage: 9V
  • Reverse Power Protection: Yes
  • Over Voltage Protection: Yes
  • Dimensions: 4.5” x 4” x 1.7”
  • Input/output Connectors: 1/4” mono, Switchcraft style jacks
  • Weight: Approx. 1 pound

* Subject to change without notice


More Info

Additional information

Effect Type

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