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Fuzzlord Effects Riff Master OC44 main image

Fuzzlord Effects Riff Master OC44

Fuzzlord Effects Riff Master OC44

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Page last updated Feb 23, 2026

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Description

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Inspired by Tony Iommi’s modified Dallas Arbiter Rangemaster effect unit used throughout the classic Black Sabbath recordings of the 1970’s, this pedal is designed to overdrive the front end of a slightly saturated tube amplifier into thick harmonic distortion while accentuating response and gain across a selected range of frequencies.

Each Fuzzlord Riff Master is loaded with a hand selected, exceptionally rare, NOS Phillips/Mullard “Red Dot” OC44 Germanium transistor as used in the original amp-top units from the 60’s. A four-position Depth control sets the pass-band of boost, which can be adjusted from the stock treble boost setting through to a smooth, harmonically rich, full range boost.

The circuit provides gain of up to 24db across the boosted frequency range, which proves highly responsive to both pick attack and guitar volume setting.

Product specs

Power

9V

Videos

Does It Doom?

Fuzzlord Effects Riff Master OC44 Demo - Tony Iommi Rangemaster Treble Booster

Video thumbnail for Fuzzlord Effects Riff Master OC44 Demo - Tony Iommi Rangemaster Treble Booster by Does It Doom?

Fuzzlord Effects Riff Master OC44 Demo - Tony Iommi Rangemaster Treble Booster

Does It Doom?

Video thumbnail for Fuzzlord effects Riff Master OC44 tone test, Black Sabbath debut album tone by Rocknroller795

Fuzzlord effects Riff Master OC44 tone test, Black Sabbath debut album tone

Rocknroller795

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