Power switch wiring

[saturated]

Ok guys ya know I don't know much but does this kinda raise some eyebrows why not put the fuse and switch on the primary side

But idk so that's why I'm asking 

That box in the lower left hand corner connected to the blue and white wires is the power button it's a tuner btw

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[galaxiex]

It avoids bringing full line AC to the front panel, safer and quieter.

Running full line AC beside the board risks noise coupling to the audio,
and/or interference to the tuner.