Guitar Systems

Guitar Systems TrebleTool Junior

Like his big brother the TrebleTool Junior is a flexible Treblebooster based on the legendary Dallas Rangemaster. Adjust the character to any guitar or amp with the TMF (Treble Mid Full) adjustment.


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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 Rangemasterextended with features that increase operating flexibility andsolve short comings of the original design but do not change the original Rangemaster sound character.

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.

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


Gain control - adjust the effect output volume
Continuous variable range control (T.M.F.) - dial in the amount of bass 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