Quote:
Originally Posted by jr_tech
Looking at the dot pattern, I think that I am seeing a "hollow beam" that has less current in the center... perhaps the center of the cathode is "used up" or it may be ion damaged. I have seen cathodes where the coating in the center has been totally removed by ion bombardment, down to bare nickel. 
If that is the case, It will not "wake up" with the application of 8 volts to the heater, but what have you got to loose by cooking it for a few hours?
jr |
That what I was thinking too, a hollow beam.
I tried a brightener. That did little. I then cooked it, but the Beltron manual suggested 10 volts so that's what I used. It made it almost watchable, but it faded after a few minutes of use.
It's in a box and will be on its way to Scotty tomorrow.
John