Glentek servo amp power transistors


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I have a Glentek GA370 DC servo amp with blown output transistors. The numbers appear to be a rebranded Glentek number because they do not appear on any transistor or semiconductor cross reference. They appear to be made by Harris. The transistor number is GTK45708. I assume the 08 is for 800V. Anyone got any clues?
I can find you thousands give me a call I can fax a photo of the 3 pin transistor. 727 520 9191 ext 5408 or ask for Jason Kochen