Here is Takezo's response from the other site:
"wooaudio has told me in the past that the wa6 implements a soft-start when initially
turned on... and the amp puts only 180v on the rectifier anode plate normally (much lower
than the characteristic 450v, with max. of 550v.) contributing to the safe use of these
rectifiers on the wa6... having said that, i'd lower the first caps to 22uf or lower, just to
be on the safe side. the wa6SE implements a choke in their C-L-C path with the first cap
being 10uf, with a delay circuit added on also, so should be fine. "