07-10-2021, 07:18 PM
HI Sam and Peter
I have seen mentioned that the VCR97 might do but I have never seen one fitted, yet. I sure I have one somewhere and maybe one or two others of a similar size.
I have tested the CRT and there is some emission.
The heater in intact and draws very close to 1A with 4V across it.
With 10V across the grid and cathode it drew around 400uA.
With the grid and cathode strapped together I put 3KV from a high impedance source across the cathode and final anode and it drew approximately 110uA.
Nothing visible on screen.
There is some emission, whether it is enough I am not sure.
Frank
I have seen mentioned that the VCR97 might do but I have never seen one fitted, yet. I sure I have one somewhere and maybe one or two others of a similar size.
I have tested the CRT and there is some emission.
The heater in intact and draws very close to 1A with 4V across it.
With 10V across the grid and cathode it drew around 400uA.
With the grid and cathode strapped together I put 3KV from a high impedance source across the cathode and final anode and it drew approximately 110uA.
Nothing visible on screen.
There is some emission, whether it is enough I am not sure.
Frank
