Mesa/Boogie Express 5:25 Plus 1 x 12" Tube Combo Amplifier Features:2-channel, open-back combo amplifier1 x 12" speaker5 x 12AX7A, 2 x EL84 all-tube signal pathSwitch between 25-watt Class A/B operation, 15-watt Class A operation, and 5-watt Class A operation for incredible tonal versatilityImprove..