REVIEW EVH 5150 III LBX 51-nifty Hungry for more power? The 5150 range has something for you… The range-topping 5150 III 100-watt head (£1,719) has no less than eight 12AX7 preamp valves and four 6L6 power valves, together with dual speaker outlets and a line out. Three channels for clean, crunch and lead, each with independent gain, volume and tone controls, mean you can precisely tailor each channel’s sounds.