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Randall built the KH103-U as a Kirk Hammett signature tube amplifier head, positioned as the same model Hammett used both on the road and in the studio with Metallica. It sat at the top of Randall's signature offering for the collaboration, delivering 120 watts across three fully independent channels, each with its own gain voicing modes. Engineering was handled by Mike Fortin.
The preamp section runs nine 12AX7/ECC83 tubes, with four 6L6 output tubes each carrying individual bias settings. Three independent channels are controlled via dual MIDI-switchable master volumes, and the unit provides two tube-driven FX loops switchable between series and parallel operation via MIDI. Seven MIDI-assignable functions are available per channel. The rear panel carries five speaker jacks accommodating 4, 8, or 16 ohm loads, a line out with level control, MIDI in and thru, and two FX send and two FX return jacks. A three-button MIDI footswitch was included with the unit.
Owners sourcing replacement 12AX7 or 6L6 tubes, footswitch replacements, or speaker cables compatible with the multi-jack output section should use the impedance and tube complement above as the reference point; the individual bias adjustment provision on the output stage means any retubing should be approached with that feature in mind. For further parts and service guidance, contact a qualified amplifier technician.
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Since 2007
