Hi i struck a major nasty problem on my viewfinder part of my project i was running my crt on 5v for testing i got to the stage of wanting the focus nice and sharp so guessed like most valves it should be running at 6.3v ...it worked ...well then it died ! :0 i have an open heater ...
OK i still have another little crt or 2 to play with so i found the heater on this one and slowly rased the voltage till it glowed ..which was only 3 or 4 volts ..then it died !!!! arrrrrrrrrrrrrrrrrrrrrrrrrrrrr
another open heater Ok i tried a little tip i recalled somewhere stored in my 2gig memory stick in my head if you run a eht across the heater sometimes it will weld it back ...well it worked for the tiny tube the larger older one i was using seems not perhaps not enough eht who knows ..
But any case it has me wondering could a damaged crt still work as a cold cathode crt ?
By perhaps by running a negitive eht to the damaged heater would this not send electrons to the tubes anode it would need 2 ehts?
I am also wondering if it could work on a much lowwer voltage .
I think it would work but not sure about sparking to the cathode and second anode .....mmmmmmm