Educated guess... 2SC901 NPN,.... if PNP then maybe MJ901 darlington (but doubt that)

Quote Originally Posted by asto View Post
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...Then I have another one for you Swarfing..

This isn't a drive question but, again this module(Parajust single to three phase inverter) carries coding which is not common for TO-3 Motorola transistors.
Can you tell what type these transistors may be?

cheers