Anytime 1962, Sunday night, 6:30 PM. Finish up dinner. Fire up the electronic campfire. Nothing........Shit, remove the back of the set, look for the tube that doesn't have a glowing filament, power down, wait 2 minutes, pull it out, Dad loads us into the car, head to the Safeway Grocery Store. The Tube tester was on the front wall, pop the suspect tube in, verify it's bad, find the Store Manager to get you a new one. Hop back in the car, go home, pop the tube in, replace the cover, turn on power at 6:59 PM. Viola......Wonderful World of Disney at 7:01 PM.
My Dad taught me how to do that when I was 6 years old.