KHDK Electronics No. 2 - Clean Boost



KHDK Electronics

The No. 2 is KHDK’s original Clean Boost, utilizing the strength of KHDK’s unique circuit. Providing a warm, tube-like boost, it was designed for those who appreciate a natural and subtle gain. Best used as a tool for shaping your tone on a quality all-tube amp, the No. 2 allows the organic and transparent EQ controls to fully develop your tone.

All our pedals are proudly handcrafted and quality tested in the USA.


The KHDK No. 2 Clean Boost is powered by a single 9V battery. You can access the battery connection by unscrewing the bottom plate of the pedal enclosure. Alternatively, plug in an external 9V DC (center negative) power supply.


  • Gain: Controls the unity gain of the circuit.
  • Volume: Controls the overall output volume of the No. 2.
  • The hi/lo switch: Is tied directly into the gain. The lo setting offers a warm, tube-like boost.  The hi setting adds saturation, compression and a powerful mid boost.
  • Bass: Controls the bass and lower mid-frequency gain. The bass is tied into the gain, making it a secondary gain control enhancing lows. For boosting an overdriven tube amp, it is recommended to lower the Bass control setting for a tighter bass response. For single note soloing, turn the Bass control clockwise.
  • Treble Control: Is a passive low-pass filter, cutting high end and offering a wide frequency range. The setting depends on your amplifier; we recommend cutting the treble on brighter amps to achieve a warm tone.
  • Footswitch: Engages your No. 2 to “on” or True bypass mode.


Locate the input and output jacks on the No. 2 Clean Boost and make sure there is 9V power flowing through the pedal.

Start your No. 2 with the controls at 12 o’clock and the hi/lo switch set to lo.

Your amplifier needs to either be in standby mode or off when you plug your No. 2 in. Start off with your amplifier in clean mode.

Most recent forum threads

Where to find one?

your browser doesn't support AJAX?

fx pedal stompbox stomp box guitar effects pedal amplifier amp amplification preamp pre-amp volume/amplification
Syndicate content

Subscribe to our newsletter

Also check out Effects Database's social media accounts: