Mad Professor Ruby Red Booster

A double heritage "treble booster" and "amp pusher" in the Björn Juhl tradition

The Ruby Red Booster captures the spirit of two complementary approaches: on one side, the treble boost designed to bring presence, bite, and clarity (particularly effective for standing out in a band mix); on the other, a broader boost capable of pushing an amp to the breaking point, up to a thick and musical saturation. By combining these two circuits in a single signal path, the pedal covers a range from simple brightness enhancement to a true character drive, with a final volume control to keep output level in hand.

For whom, for which styles, and in what context?

This pedal is aimed at guitarists who want to sculpt the attack and control amp saturation rather than stacking gain stages randomly. In blues, classic rock, indie, pop, stoner, or even more modern contexts, it serves as much to boost a solo as to add edge to a clean tone or thicken an already present crunch.

On stage, the Ruby Red Booster is formidable for switching from rhythm to lead without changing your amp's DNA. In the studio, it helps place a guitar in the upper spectrum, enhance the definition of a neck pickup, or bring out a fuzz/overdrive that needs a bit more focus. And if your chain includes many pedals or long cables, the buffer option is a real plus to maintain dynamics and precision.

Controls, architecture, and internal buffer: a simple yet highly "adjustable" pedal

The Ruby Red Booster works as a combination of two boosts in series with a master volume at the output. The idea is simple: you adjust the amount of brightness and cut via the Treble section, then push (or saturate) via the Boost section, before setting the final level with the Master. This architecture allows for very different sounds without multiplying knobs, and above all, keeps an organic playing feel.

Treble acts as a treble booster with carefully chosen bandwidth and frequency, featuring a bass curve optimized to avoid muddiness. Boost is designed to work the amp input (or another pedal) and can range from a substantial clean boost to a heavily driven overdrive, all while remaining musical. Finally, Master controls the overall volume of both stages and can also influence how the pedal saturates depending on the settings.

Inside, a selector allows you to choose the bypass behavior: true bypass or bypass with buffer. With the buffer activated, the pedal helps combat signal and definition loss typical of long cables and crowded pedalboards, while maintaining a natural feel under the fingers.

The sound

The Ruby Red Booster's sonic signature lies between brightness, presence, and musical grain. In treble boost mode, it delivers a clearer high end, with just the right amount of "cut" to bring out pick attacks without making the tone harsh. In broader boost mode, it adds density and responsiveness: ideal for waking up a clean channel, beefing up a crunch, or transforming an "edge of breakup" base into a true lead sound.

The strong point is its responsiveness : the pedal follows playing dynamics well (sharper attack, guitar volume, right-hand nuance) and behaves like an additional preamp stage rather than a simple "louder" button. It is also used by guitarists such as Naoya Ogura, Jarmo Hynninen, and Tatiana Para, proof of its relevance in contexts ranging from rock to more modern textures where the guitar must remain intelligible.

Technical specifications

Effects	Boost, Overdrive	Type	sector
Format	Pedal	Use	electric guitar
EQ	Treble	Color	Red

Controls	Master, Treble, Boost	Output impedance	50 kOhm
Treble boost	from 0 to about 15 dB (peak at +15 dB at 4 kHz )	Signal-to-noise ratio	110 dB
Boost section gain	up to about +40 dB	Effect bandwidth (at 3 dB)	70 Hz to 7 kHz
Modes	true bypass or bypass with buffer (internal selector)	Consumption	6 mA at 9V
Voltage gain buffer	1x	Accepted voltage range	8V to 18V
Input impedance	500 kOhm	Power supply	9V battery type 6F22 or power adapter (depending on your setup)