In article et, robert
casey writes



One needs a special respect for working with
1,000v+ anode voltages.

Then there are tubes like the 6BK4, intended as color
TV set very high voltage voltage regulators. 25KV. It's
a triode with a mu of 2000. Heard some people
use them in audio amps. Electrostatic speaker drivers?


Yes they used a shunt regulator in the old Philips valve K9 ? chassis
and that was in a box of its own, not so much as the high voltage but it
was an X-ray generator!....
--
Tony Sayer