Marshall 2061X All Tube Hand Wired Guitar Amplifier Head (20 Watt) The Marshall 2061X Head: Original versions of this new 20 Watt, all-valve Lead and Bass 20 Head are now highly collectable. The 2061X has two channels -- Lead and Bass -- both of which boast the same, simple features: two inputs (High and Low Sensitivity) and controls for volume and tone. The 2061X is built with 2 x ECC83s in preamp, 2 x EL84s in power amp and was first made from 1967-1973. To enhance the user-friendliness of the 2061X, an impedance selector has been added to the rear panel (switch able between 4, 8, 16 Ohms) and both the Mains and H.T. fuses are now accessible via the rear panel. These new features have no tonal impact on the amplifier whatsoever.