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i believe that one divides off main b+ to leak a startup voltage.
just enough to make it run somewhat till +12 comes up from the fly.
maybe the osc ic or whatever is loading it down?
been a while since i worked on one of those.
at least you dont have the sg-613 eater model.
sonys of that era had resistors that would have the coating crumbling off. some were fine and some would be way off.
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