Do I need to use a diode with a very basic CRT?

[RayRay1132]

I'm working on a project using a very simple CRT. (Just the cathode and anode). Do I need to use a rectifier on the cathode of the CRT? Will it rectify by itself?

 

[JimB]

The quick answer is yes, but there may be some rather odd side effects which render the scheme useless.

JimB

 

[RayRay1132]

The quick answer is yes, but there may be some rather odd side effects which render the scheme useless.

JimB

Wouldn't the crt act like a diode though since the filament is heated?