8 Nov
2007
8 Nov
'07
1:45 a.m.
On Thu, 8 Nov 2007, Tony Duell wrote:
This may be a UK .vs. US language difference, but to
me :
A 'filament' is a thin wire, heated electircally. A heater (in a valve)
is a particular type of filament
A filament that's also the cathode (as here) is a 'directly heated cathode'
A filament that heats a separate cathode is called a 'heater'. The result
is caleld an 'indirectly heated cathode'
Exactly; it's the same in German: "Heizfaden" (heater/filament),
"direkt
geheizte Katode" (directly heated cathode) and "indirekt geheizte Katode"
(indirectly heated cathode).
Christian