CRT test

[TVTim]

Originally Posted by Username1

hook them up full brightness, run for a day or two, increase heater voltage a little, then hit them with a stick near the end of the tube where the red lights are till you hear a spark inside. I did it to xl-100 tubes all the time, only one out of say 20 did not get better.....

Being far from an expert, to me, this sounds like it would snap off the end of the tube.