Ken,

I recall one amp used a voltage quadrupler to get 600 volts from
the 120v ac line and had 10 tubes with the heaters wired in series.
One tube was a driver, and 9 were grounded grid finals.
(A bit of a shock hazzard perhaps.)

I've seen something similar here in the UK 20+ years back and remember
the amateur who built the thing. I think he was playing around the Kw
level and with no transformers in sight.

We do have a head start on you fellas with 240v @ 50Hz :-)

A 'bit' of a shock hazard is kind of an understatement don't you think.
--
Philip de Cadenet G4ZOW
Transmitters 'R' Us
http://www.transmittersrus.com