D
dansawyeror
- Jan 1, 1970
- 0
All,
I just picked up a used hp 8505a. The CRT display is blank. I am looking
for advice on the order of testing. It has been years since I have done
any HV work. There is a possibility the tube itself is bad.
The CRT is a vector display, not a raster display. I have the schematics
and some expected voltages. The main connections are straight forward:
filament, cathode, grid, focus and vector controls, and HV.
I have measured the filament, it is a few Ohms.
What is a reasonable range for the control grid?
What measurements can be made of the tube?
What reasonable measurements can be made of the PS?
How can the HV be tested?
Thanks - Dan
I just picked up a used hp 8505a. The CRT display is blank. I am looking
for advice on the order of testing. It has been years since I have done
any HV work. There is a possibility the tube itself is bad.
The CRT is a vector display, not a raster display. I have the schematics
and some expected voltages. The main connections are straight forward:
filament, cathode, grid, focus and vector controls, and HV.
I have measured the filament, it is a few Ohms.
What is a reasonable range for the control grid?
What measurements can be made of the tube?
What reasonable measurements can be made of the PS?
How can the HV be tested?
Thanks - Dan