[triumph406]

Why not send it to Glentek for repair?

[DAN HARRISON]

Why not send it to Glentek for repair?

I open the TO-3 case and check the die. the MJ10023 NPN has the same electrical configuration as the GTK45595. both are made by motorola.
this is the Description of the MJ10023.
Collector?Emitter Voltage, VCEV ........ 600V
Collector?Emitter Voltage, VCEO(sus) 400V
Emitter?Base Voltage, VEBO ..............8V
Collector Current, IC
Continuous ..........................................40A
Peak .................................................. ..80A
Base Current, IB ..................................20A
Total Power Dissipation, PD
TC = +25?C ........................................250W
Derate Above 25?C 1.43W/ ............... ?C
TC = +100?C ......................................143W
Operating Junction Temperature Range, TJ ........ ?65? to +200?C
Storage Temperature Range, Tstg ....................... ?65? to +200?C
Thermal Resistance, Junction?to?Case, RthJC .. 0.7?C/W

hope this helps.