Marshall 1959HW Handwired 100w Head The Marshall 1959HW Hand Wired 100 Watt "Plexi" head is considered by many guitarists to be the definitive rock n roll guitar amplifier. The timeless tone of vintage handwired, all-tube Marshall amplifiers have made them highly desirable to collectors and sonic connoisseurs alike. All of the original components and materials from the original '59 amplifier were used or reproduced in the 1959HW.