Electro-Harmonix 44 Magnum 44W Guitar Power Amplifier The Electro-Harmonix 44 Magnum guitar amp provides 44W of clean and natural power and also delivers true amplifier overdrive at the turn of a knob. From your pocket to the stage, the E-H 44 Magnum is a perfect gigging and practice amp. Despite being described as a "guitar head" the 44 Magnum has the character and control to work with any electric-powered instrument. Flip the brightness switch for a more defined top end. The Electro-Harmonix 44 Magnum amp has the sweet tone of the legendary 22 Caliber but with an extra power edge that can make a difference.