07-12-2020, 10:24 PM
I am not getting notifications from the site!That was the receding edge of the glass, I think the camera was focusing in the glass face, or edge.
Most of my magnifying lenses are scratched though use in the garage or generally being stored in the drawer, I have found a small unit on one of the 3rd Hands and took this shot, AF illuminator switched off.
I think for the time being I will just be happy I have something viewable.
If I go to bigger electrostatic tubes I am going to have to up the EHT and if keeping the anode of the video valve feeding the grid will have to have very high voltage caps also going to the deflection plates to the timebase output.
There are only three alternatives that come to mind.
1) Go negative HT and figure a way of dc restoration of the video down at something line - 1K2 Volts.
2) Try to go magnetic deflection which with these Radar CRTs I have would be interesting trying to make some scan coils and sort out the circuit.
3) Leave it as it is and call the exercise complete.
Adrian
Most of my magnifying lenses are scratched though use in the garage or generally being stored in the drawer, I have found a small unit on one of the 3rd Hands and took this shot, AF illuminator switched off.
I think for the time being I will just be happy I have something viewable.
If I go to bigger electrostatic tubes I am going to have to up the EHT and if keeping the anode of the video valve feeding the grid will have to have very high voltage caps also going to the deflection plates to the timebase output.
There are only three alternatives that come to mind.
1) Go negative HT and figure a way of dc restoration of the video down at something line - 1K2 Volts.
2) Try to go magnetic deflection which with these Radar CRTs I have would be interesting trying to make some scan coils and sort out the circuit.
3) Leave it as it is and call the exercise complete.
Adrian
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve
