Power protection toriods any good?

Hi Everyone,

I was reading Duane Byland's book the other day and he said in it that he
often wonders if protective power supply toroids on neon sign transformers do
any good at all. He said that for them to do any good they would have to have
an impedance as big as or bigger than the impedance of the neon. Since neons
have such a huge impedance (they have thousands of turns around an iron core)
surely a piddly little toroid with a few turns of wire wrapped around it will
do almost nothing? Won't the huge impedance of the neon (compared to the
toroid) mean that any voltage kickback will be dropped almost entirely over
the neon and hardly any at all over the toroid?

Best Regards,

-- Mark
       _/_/_/   _/_/_/_/       Mark Conway
      _/    _/    _/          Deep Thought BBS, Auckland, New Zealand
     _/    _/    _/          A FirstClass(tm) Macintosh GUI BBS
    _/_/_/      _/          Internet: mconway-at-deepthnk.kiwi.gen.nz