On April 16, jpero_at_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
Received on Tue Apr 16 2002 - 19:51:30 BST