Might be something totally different, but that is my working theory. What comes to mind is the power tubes failed and shorted the high voltage to the low, and all those blew. Those supplies mainly power the preamp heaters, the solid state circuits, and the relay. THE most common reason for high voltage fuses to blow is bad power tubes.į3,4 are low voltage supply fuses. F1 is the high voltage fuse, not the mains fuse.
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