Marshall 2203MS JCM 800 Modified Amp Head

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The Marshall 2203MS JCM800 Modified takes one of the most influential British valve amplifiers ever produced and equips it with some of the modifications guitarists have traditionally added to push the circuit further. At its core is the unmistakable JCM800 2203 formula: a single-channel signal path, separate Pre-Amp and Master Volume controls, a powerful four-EL34 output stage and the aggressive midrange response that helped define hard rock and heavy metal. The modified version expands that classic platform with two selectable overdrive modes, a Mid-Shift function and a Tight switch. These additions allow the amplifier to move from warm breakup and traditional JCM800 crunch to more saturated, focused and contemporary high-gain sounds without losing its direct, responsive character. A switchable series effects loop with selectable pedal and rack-processor levels adds practical flexibility for modern rigs, while its full 100-watt output delivers the headroom, bass authority and projection expected from a professional Marshall amplifier. At A Glance Feature | Details | Brand | Marshall | Model | 2203MS JCM800 Modified | Product Type | All-valve guitar amplifier head | Condition | Brand New | Output Power | 100 watts | Channel Configuration | Single channel | Inputs | High and low sensitivity | Additional Gain | Three-position OD switch | Overdrive Modes | Off, OD I and OD II | Midrange Function | Switchable Mid-Shift | Low-Frequency Control | Switchable Tight function | Preamp Valves | Two ECC83 | Phase Splitter | One ECC83 | Power Valves | Four EL34 | Effects Loop | Switchable series send and return | Effects-Loop Levels | -10dBV and +4dBV | Speaker Outputs | Two | Selectable Impedance | 16Ω, 8Ω or 4Ω | Country of Manufacture | United Kingdom | Main Appeal | Classic JCM800 response with factory-installed gain and tone modifications | Best For | Classic rock, punk, hard rock, alternative music and metal | Skill Level | Experienced to profes