The 100-watt Marshall requires no formal introduction, having been a cornerstone of the rock and roll sound for over 50 years. This 1973 was made shortly after they switched over to circuit boards, and has lost nothing in terms of sound quality. It's very close to all original, with the only things being changed are coupling caps in the phase inverter, the bias feed resistors, and 2 caps in the preamp changed for older Rubycon types. Please see circuit pictures for further details.