Output transformer for Marshall 100W amps, used since 1966 for all 100W models ...
Marshall - Super Lead 100 MKII - Tube Guitar Amplifier Head - 100w - x499B (USED)
Marshall MG100 HDFX 100 Watt Head (One of my favorite amps of all time) - YouTube
Amazon.com: Marshall JVM210H 100-Watt Guitar Amp Head : Musical Instruments
Marshall MG100HGFX 100w Head Marshall Electric Guitar Amp The ultimate live and studio amp with four channels and a wide variety of digital FX. The powerful 100w MG100FX offers a great range