The twin-channel DSL100H monster has the same tube compliment and feature set as the iconic DSL 100 with a few upgrades. Marshall has added a Resonance control as opposed to the original's fixed Deep switch so you have total control of how much low end girth you add. The spring reverb has been replaced with studio-quality digital reverb. A rear panel Pentode/Triode switch drops the output to 50W. A two-way footswitch is supplied. Put together a full stack with this head and you have a seriously epic rig.