Marshall JTM-1C LTD 50th Anniversary 1W Combo, Second-Hand Overview Item in good condition. Minor signs of use (small scratches or marks) The Marshall JTM1C is a limited edition 1-watt all-valve combo amp, crafted to commemorate 50 years of Marshall. Delivering classic 1960s Marshall tones at sensible volume levels, the JTM1 head and combo are perfect for those who want to experience vintage Marshall sound. These highly collectible amps are in high demand, so act fast if you want to own a piece of Marshall history.