Re: Quad 303 repairs.
My personal experience is that about four times out of five, when an amplifier blows its fuse instantly at switch-on, the output transistors will be the only parts needing replacement. If one of the output transistors fails short-circuit, it usually takes its partner and the power supply fuses with it before anything else has a chance to get damaged.
But if there is any other faulty component besides the output devices, that can upset the voltages enough to kill all the other transistors.
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If I have seen further than others, it is because I was standing on a pile of failed experiments.
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