Up for sale is a Mad Professor Custom Ruby Red Booster (RRB) pedal in Excellent Condition.

Designed by BJörn Juhl (BJF), this pedal combines two famous booster circuits—the Little Red Trebler and the Red Rooster Booster—alongside a Master volume control and an internal switchable high-quality buffer. It functions exceptionally well as a treble booster, clean boost, or singing overdrive, delivering up to 40dB of boost to drive valve amps into natural saturation.

Note: This unit features the desirable factory-printed "CUSTOM" text enclosure branding.

Condition & What’s Included:

 Condition: Excellent cosmetic and 100% fully functional condition. Very clean candy red finish, intact graphics, original chicken-head knobs, and smooth footswitch.

 Includes: Original Mad Professor factory box, user documentation/manual, and original accessories (sticker, feet, etc.).

Key Features:

 Dual BJF Booster Architecture: Combines a high-frequency treble booster (+15dB) and a full-range clean/overdrive booster (up to +40dB).

 Internal Buffer Switch: Choose between True Bypass or a high-grade JFET Buffer mode via an internal DIP switch to preserve high-end detail across long cable runs.

 3 Intuitive Controls: Master Volume, Treble Boost, and Boost Level knobs.

 Versatile Tone Shaping: Tightens up low-end response, boosts solo volume, or drives tube preamps into smooth harmonic crunch.

Product Specifications

 Brand: Mad Professor Amplification

 Model: Ruby Red Booster (Custom Series)

 Circuit Designer: BJörn Juhl (BJF)

 Type: Treble Booster / Clean Boost / Overdrive

 Bypass: Internal switchable True Bypass / Buffered Bypass

 Inputs/Outputs: 1 x 1/4" Input, 1 x 1/4" Output

 Power Requirements: 9V DC, Center-Negative (or 9V battery)