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Randall built the Thrasher 50 as a 2-channel, 4-mode tube amplifier head rated at 50 watts, positioning it as a compact but robust unit within the Thrasher line. The circuit runs on a complement of four 12AX7 and two 6L6 tubes, with a global tube boost stage sitting across both channels.
Channel 1 provides separate high-frequency and low-frequency gain controls alongside a full three-band EQ — Bass, Middle, and Treble. Channel 2 offers independent Volume, Gain, and Tone controls. Both channels share global Presence and Depth controls for power-amp voicing, and a Master Volume. The effects loop is a class A discrete instrument-level design with two sends and two returns. Speaker outputs cover 4, 8, and 16-ohm loads across five output jacks, and the rear panel also carries MIDI In, MIDI Thru, and a Line Out. The included RF2-LED footswitch handles channel switching and boost mode. The chassis features heavy-duty metal front and rear grilles and corners throughout.
Owners sourcing replacement 12AX7 or 6L6 tubes, footswitch cables, or speaker cables should confirm pin configurations and impedance matching against these specifications; a qualified amplifier technician can assist with biasing after any output-tube substitution.
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From spec questions to full builds — players who have lived this gear since 2007.
Since 2007
