I am absolutely devastated. After a lot of work, i managed to have an hp8568b working, but after moving the display unit on the table i lost completely the image. The ugly thing is that i don't' see anymore the dim light of the filament of the CRT near the neck of the tube and this is very sad.
So or i have a problem with the filament supply, or i have lost the tube. I cannot find anywhere which are the pins of the crt that goes to the filament, because my first measure is to check if the filament is interrupted.
I don't' want to put the tester near high voltage , so , i just want to measure the continuity of the filament. Can anyone help me to find which pins are filament related?