[turretslug]

Further to the surface area point, it's not so unusual to find two or more parallelled reservoir capacitors in place of one bigger one where ripple rating looks to be marginal or doubtful- say 2x 220uF or even 3x 150uF in place of the 470uF will nearly always have a usefully increased combined ripple rating for capacitors from the same series etc. Even in a high-power valve amp, you won't run into the need for chunky capacitor-linking busbars that a PSU of the same wattage but one-tenth the voltage might need to properly share the ripple.