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TR9 (BD435) is fine. So it seems that the TR17 is where the problem ends. I need to think about this because I just can’t find anything wrong. Desoldered all transistors in the pathways to be sure, they all test fine. F32 transistors also all fine. No shorts. So why this transistor blows in such a simple circuit when not even full power is applied is a mystery at the moment.
Suggestions are very much welcome 🙂