There's an interesting article over at Stereophile which is mostly about the CT5 preamplifier, but it also talks about how they have moved away from multiple regulation stages as they did in the PV-12 and other preamps, to simplify the design.
I still need the first stage to help drop the voltage, becuase I'm still toying with the idea of removing or reducing the resistor between the two storage caps. Also, by doing it this way, I'm adding more storage capacitance than I would otherwise. I've added nearly 16uF to the overall design, 8uF per channel. That's pretty good at 330V!
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