Hi there,
I have this 100MHz 2 Ch analog scope which is facing out of focus problem. I have checked the voltage at the CRT as shown below:-
VK = -2461V @ heater and cathode Vg = -2535V @ control grid Vf = +328V to +383V @ focus grid when I adjusted focus knob.
Is the focus voltage normal? If not, what's the correct value?
Thank you for your advice in advance.