Crazy Tube Circuits Unobtanium


Dual overdrive with Dumble and Klon.

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SKU: 405103

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Introducing the Unobtanium, a rare sonic element born out of legendary tones!

A mythical overdrive meets the tone and feel of two iconic amplifiers. We have accurately recreated the circuit of the high headroom overdrive with the magic blend of clean and overdriven tones and added extra features for versatility. The amp-in-a-box section uses an all-analog circuit to capture the essence of two legendary D-style tube amplifiers. From tube-like compressed fat clean to sweet singing overdrive with blooming harmonic overtones. Combine both sides for near infinite smooth sustain and enter sonic bliss while a passive series effects loop gives you the option to connect your beloved pedals between the overdrive and amp section, building your ideal rig.


Right side: faithful reproduction of the mythical overdrive circuit including the fabled germanium diodes

Wide gain range control: from transparent boost to high headroom overdrive

Treble control is an active circuit to boost or cut treble

Volume knob sets overall output. Huge amount of dB boost available

Toggle switch to select between the original buffer bypass to add clarity and run long cables or true bypass

Toggle switch to select between stock clipping / compression or enhanced gain and headroom/output as you turn gain knob clockwise

Left side: D-style amp in a box overdrive

Gain control: from clean boost to sweet singing overdrive

Emphasis control is a pre-drive EQ to control presence and bottom end response

Tone knob controls the amount of post overdrive high end frequencies

Volume knob sets overall output. Match bypassed volume or use as a clean boost or preamp

Toggle switch selects between 2 distinct D-style overdrive circuits

SSS: clean and transparent overdrive with natural organic compression

ODS: higher gain overdrive with enhanced mid frequencies and harmonic overtones

External footswitch input jack to select amplifier voicing (XT Footswitch – sold separately – bypasses on board toggle switch)

Internal trimmers adjust EQ and volume boost of D-style overdrive voicings

Passive series effects loop to connect other pedals between the two sections or use them separately as independent effects

Boosts voltage internally at 18V DC for higher headroom and tube-like performance Warning: This unit was designed for 9V DC input only. Do not use a higher voltage power supply.


Bypass True bypass
Power consumption 9V DC center negative (power supply sold separately)
83 mA
Dimensions H: 5,3 cm (incl. knobs)
W: 11,9 cm
D: 9,7 cm
Weight 419 g.
Manufacturer warranty 5 years warranty from Crazy Tube Circuits