Chuck Harris wrote:

Today it is trivial to make a simple switching power supply that can provide
a couple of hundred volts at 98% efficiency, why not make one of them, and
use some real tubes?

The problem I've encountered with switching supplies is that they're so
blasted noisy because of the fast risetimes in the high-current parts
of the supplies and because they're usually not very well shielded and/
or decoupled.

--
Ah, yes, _The Dying Earth_: a wonderful title, greatly spoiled by the
book.

-- Nix, in a newsgroup inhabited by a better class of people