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Old 04-27-2018, 10:30 AM
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Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,762
Pro tip: Tubes that have been dormant for ~10+ years will have contaminates bond with the surface of the cathode blocking emissions...Collectors refer to it as the CRT being sleepy. A sleepy CRT will typically wake up if you leave in in emissions test mode for 10-45min...Sometimes increasing the heater voltage by 40% will be needed to wake it up...Once it wakes up it should stay if you give it use within a few months...The wake-up process is much gentler than a rejuve and should be done first.

If it was asleep as I suspect (assuming you did not damage it with the rejuve) it is probably still a fairly good tube for the long haul. One additional check is to switch off the heater or reduce it's voltage signifficantly and see how long it takes for emission to hit bad. If it drops instantly there is not much life left 3-10 seconds is a tube with plenty of life.

If you have not done a TV resto before don't sweat CRT lifespan too much...If it don't have much life left it makes a good set to learn on since if you screw it up bad it won't feel as bad if you know the CRT life was limited...Also if you do get it working you can run it into the ground and get the most of the CRT while it lasts.
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