Tone library / Metallica / Master of puppets

Master of puppets amp settings — Boss Katana Boss Katana ktn-head 100w amp

The Metallica guitar tone for “Master of puppets”, dialed in for a Boss Katana Boss Katana ktn-head 100w amp with a Ibanez Ibanez Rgrt421. Studio version, Master of Puppets album (1986, Sweet Silence Studios, Copenhagen)

Original rig

Mesa/Boogie Mark IIC+ preamp → Marshall JCM800 100W power amp, Jackson King V with EMG 81 (bridge), BB/Aphex parametric EQ in effects loop with V-curve

Tight, aggressive, scooped-mid thrash rhythm with razor-sharp pick attack and crushing low end

Amp settings — Boss Katana Boss Katana ktn-head 100w amp

CHANNELBrown amp type (Marshall-voiced high gain)BRIGHToffBOOSTon

Knob	Setting (0–10)
Gain	8
Bass	7
Mid	3
Treble	7
Presence	6
Reverb	0
Master	7

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Guitar

PICKUPbridge TONE8 VOLUME10

Why these settings

Your Ibanez RGRT421 has passive humbuckers vs the original's hot EMG 81 actives — gain raised +1 to compensate for lower output. Brown amp type on the Katana is the closest voicing to the Mesa/Marshall hybrid rig. Mid dropped to 3 (original was 3-4) to recreate the V-curve scoop; the Katana's Brown voice is already mid-forward so this balances out. Use the Katana's onboard Boost to add the front-end push the original got from the Mark IIC+ preamp stage.

PRO TIPThe entire Master of Puppets rhythm tone lives in Hetfield's picking hand — strict downstrokes at 212 BPM with tight palm muting where each muted note hits like a punch. No gear will fake this; practice the relentless downpicking until your forearm burns.

Get this tone on your amp

These settings are for a Boss Katana Boss Katana ktn-head 100w amp. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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Song, artist and gear names are used to identify the tone being matched; ToneAdapt is not affiliated with or endorsed by the artists or manufacturers mentioned. Settings are AI-generated starting points — trust your ears.