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General| Model | 6912 |
|---|---|
| Anniversary | 30th |
| Speaker Configuration | 4x12" |
| Channels | 2 |
| Preamp Tubes | 3 x ECC83 (12AX7) |
| Impedance | 8 Ohms |
| Finish | Black |
| Controls | Volume, Bass, Middle, Treble, Presence |
| Weight | 18.5 kg (40.8 lbs) |
Details about the input jack socket, high/low compensation switches, and operational notes.
Details on Volume, Bright Switch, Mid Shift Push Switch, and EQ controls for Channel 1.
Details on Gain, Mode Selector, Volume, and EQ for Channel 2.
Details on Gain, Boost, Contour, Volume, and EQ for Channel 3.
Covers channel selection switches, store switch, and MIDI operational notes.
Details on Effects, Presence, Low Volume Compensation, Master Volume, Standby, and Power switches.
Covers Footswitch, MIDI, XLR, Line Outputs/Inputs, and Effects Send Trim.
Notes on Speaker Emulation, Series effects option, and Effects level balancing.
Details on Series/Parallel selection, loop level, send/return jacks, and operational notes.
Covers Damping Select Switch, Power Selection Switch, and associated operational notes.
Covers fuses, loudspeaker outputs, impedance selector, and Pentode/Triode selection.
Notes on Pentode/triode use and mains input/fuse connection.
Details on footswitch use, speaker connection importance, and impedance switching notes.
Table listing various Marshall cabinet models with specifications.
Advice on seeking qualified technicians and basic checks.
Diagrams showing valve layout for Head and Combo versions.
Covers issues like no sound, blown fuses, whistling, and rattling with solutions.
Information on amplifier durability, using Marshall valves, and availability of spares.
