On 2021-01-26 08:09, Arie de Muijnck wrote:
After removing the bezel and orange filter the trace clearly shows as a
blue dot with a green afterglow. So, just as Jeff Dutky already expected,
option 76 is a P7 long persistence dual phosphor, in this case plus an
orange filter. When shining UV on the bare CRT the fluorescence and (long)
phosphorescence are both green.
Correction - when using some more ambient light and comparing with other scope screens the afterglow of trace and UV is more yellow than green. Strange how the amount of light changes one's color vision (yes, I know about rods and cones). The picture I uploaded also is more like green.
Arie de Muijnck
Arie de Muijnck