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Black Sabbath
Tone profile
What makes this tone
Signal chain
Tone Character
Recorded tone character
Gain character
Crunchy power-tube overdrive pushed hard by the Rangemaster, thick rather than fuzzy.
Bass
Very lean at the amp; low-end body comes from the guitar/cab and arrangement.
Mids
Extremely strong, hollow and boxy.
Treble
High and cutting.
Brightness / presence
Very forward.
Compression
Cranked-amp compression with a heavy, immediate attack.
Effects
Modified Dallas-Arbiter Rangemaster is the key front-end boost; no reverb is needed for the riff.
Evidence / Sources
Tone character: thick, boxy, mid-heavy, raw, crushing, vintage, dry, aggressive
Iron Man is one of the strongest evidence cases in the batch. Guitar World publishes the original guitar, pickup, Laney, cabinet, Rangemaster and physical amp settings. Tonafy's canonical six values remain a tonal representation rather than a literal copy of every original control.
Modified Dallas-Arbiter Rangemaster is the key front-end boost; no reverb is needed for the riff.
Guitar
Tony Iommi's 1965 Gibson SG Special
Amp
100W Laney Supergroup Mk 1 into Laney 4x12
Channel
Bass input, Gain 1 cranked
modified Dallas-Arbiter Rangemaster pushing the amp
Pickup
Bridge P90 pickup