Pedals that stack with the Randall KH103 Kirk Hammett Signature 3-Channel 120W Head

Colorsound Overdriver

Colorsound Overdriver takes that high gain character and pushes it toward clean boost

Xotic EP Booster

Feed a high gain signal into Xotic EP Booster and it comes out closer to clean boost

Suhr Shiba Drive

Stack Suhr Shiba Drive on top and a high gain tone tightens toward mid-forward

Electro-Harmonix Deluxe Electric Mistress

Keep Electro-Harmonix Deluxe Electric Mistress after Randall KH103 Kirk Hammett Signature 3-Channel 120W Head in the signal chain, clear of Randall KH103 Kirk Hammett Signature 3-Channel 120W Head's own gain stage

Walrus Audio Fathom

Keep Randall KH103 Kirk Hammett Signature 3-Channel 120W Head's high gain voice out front: Walrus Audio Fathom goes in Randall KH103 Kirk Hammett Signature 3-Channel 120W Head's effects loop so its ambient voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Horizon Devices Flux Echo

Keep Randall KH103 Kirk Hammett Signature 3-Channel 120W Head's high gain voice out front: Horizon Devices Flux Echo goes in Randall KH103 Kirk Hammett Signature 3-Channel 120W Head's effects loop so its lush voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)

Warm Audio Pedal 76 Compressor

What Warm Audio Pedal 76 Compressor brings here leans toward tight — that's worth building a pairing around