RFM6N50 SemiConductor - TO3 - RCA - Harris

2N4103 Thyristor 50Hz - TO3 - Harris Semiconductor

IXFH21N50 Transistor N Channel MOSFET - TO247 - IXYS Semiconductor

IXSH24N60AU1 Transistor N Channel IGBT - TO247 - IXYS Semiconductor

MTM2P50 TRANSISTOR- SEMICONDUCTOR TO-3 ''UK COMPANY SINCE1983 NIKKO''

IXGH40N60B2D1 Transistor - TO247 - IXYS Semiconductor

MTW14N50E TRANSISTOR - SEMICONDUCTOR TO-247 ''UK COMPANY SINCE1983 NIKKO''

SMP3N50F SemiConductor - SOT78 - Siliconix