Behold, CW signalled from keyed 4-1000A filament:

Many people will be real disapointed that their Beverage really doesn't
work after all, eh?

Let's let him have a wee frustration, then we'll tell him to terminate the
far end with a 600 ohm resistor ;-)

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca