Rectifier capacitor and rating query

Hi All

Just giving a Musicl Fidelity F16 a clean u and renewing main caps as they are dry as a bone(never heard a capacitor rattle before)

Looked at rectifier and noticed no caps across diodes to absorb switching noise but Philips orange drop caps wired up like this

fJkGycJ.jpg


Have seen caps across ac inputs before but never ac to ground

Anyone any ideas why its like this?

Ta for any info

John