After trying this tube amplifier I'll never go back to playing solid state amps again. Marshall says this little amp is 15 Watts. What I didn't know is that my 15 Watt amp uses steroids. I am impressed by the amps ability to push a 400 watt cabinet with four twelve inch speakers. The only thing it's missing is an effects loop. The DSL 15 watt all tube amplifier head has the capability to deliver bone crunching power.