"Creating Tools for Professionals"

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Michael Thompson playing the TrebleTool Jr.











Sam Vilo checking out the TrebleTool Jr.

(TrebleTool is switched on when video goes from grey to color)



- Gitarre & Bass July 2010 (Deutsch)

- Musikmachen.de (Deutsch)

- Guitartest.de (Deutsch & English)


Tim Pierce: „It makes your amp sound like it just was re-tubed“


Dallas Rangemaster History

The main concept of the TrebleTool Junior© is based on the Dallas

Rangemaster, a germanium transistor based treble booster developed around 1965 in London, UK by a company called John E.

Dallas & Sons Limited. The Rangemaster was used to drive Tube

Amplifiers into saturation because (high) gain Tube Amplifiers were not available during the 60‘ties. Famous guitar players who created their unique sound with a treblebooster are: Rory Gallagher, Eric Clapton, Ritchie Blackmore, David Gilmour, Bryan May and Tony Iommi.













An original Dallas Rangemaster


Technology concept

Like the original Rangemaster, the core of the TrebleTool Junior©

is a single stage transistor preamplifier based on a selected NOS

germanium transistor with the correct technical specifications

combined with a high pass filter. It creates a transparent dynamic

sound that will cut through the mix without being perceived as

over the hill. The TrebleTool Junior© is basically a Rangemaster

extended with features that increase operating flexibility and

solve short comings of the original design but do not change the

original Rangemaster sound character.

Small in size, BIG in sound

Click to zoom Text TrebleTool jr Yellow Click to zoom

EEC - Euro 209,- (incl. 21% VAT)

ROW - Euro 173,- (excl. VAT)

Handcrafted in the Netherlands


NOS Germanium transistor - a New Old Stock Germanium  transistor with the correct parameters for gain, leakage current and frequency


Gain control - adjust the effect output volume


Continuous variable range control (T.M.F.) - dial in the amount of low end with a specific guitar type or pickup combination


Tone control - adjust the amount of treble for a specific amplifier


The PaulSwitch Jr.® - robust true bypass footswitch to switch effect on/off & to avoid tone sucking in bypass operation


External power supply - (noise reduced) providing the option to use an external power supply without inducing noise or changing the character of the sound.


Reverse and over voltage protection - to protect the sensitive germanium transistor and keeping the pedal running for many years to come


Radio Frequency Interference (RFI) suppression - avoiding radio signal reception when using high gain setting in combination with turning down guitar volume