The Twintone Mark is a very versatile amp and packs a load of features in its relatively small box. It’s set up with two EL34 power tubes which put out 50 watts of power. The Clean channel has a wonderful warm and crystal clear clean sound while the Overdrive channel can produce a variety of crunch and lead tones will give you a more complex and richer sound without losing its definition and depth. The long tank spring reverb has a level control on the back panel for just the right amount of effect. This amp is in excellent condition and has spent its life in a studio rather than clubs and bars.