Re: Capacitor Selection Pi-Section Smoother.
There's something to be said for rectifiers and for solid-state HT regulators. But the point of the OP's build is to make a valve phono stage. If he was going to start putting solid-statery in then he might as well pick a quiet op amp for the audio stages and have done with it.
To be honest, low-ripple HT supplies for audio pre-amps aren't very hard to make. I'd support G6Tanuki's suggestion to go with a smallish first capacitor (strictly called the reservoir) and then a larger second one (the first smoother). I'm afraid you'll quickly get into the regime where most of the noise won't come from the HT rail but from internal noise in the valves, pickup in the signal wiring and unwanted effects in the grounds. Sorting those out is where the fun is though !
Cheers,
GJ
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