16 Apr
2002
16 Apr
'02
7:51 p.m.
On April 16, jpero(a)sympatico.ca wrote:
I know phosphors becomes fried slowly from long use
but I'm referring
to cathode emissions:
I wondered whom is right?
cathode oxide or
heater coating?
I think this is heater coating.
Wouldn't this be an issue of indirectly heated vs. directly heated,
i.e. having a cathode with an electrically isolated filament inside
vs. just a filament acting as the source of electrons? Some
filament-only tubes do have a coating, much the same as the cathode
coating I believe. Though I've never seen a CRT with no cathode.
-Dave
--
Dave McGuire "Mmmm. Big."
St. Petersburg, FL -Den