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The tubes should come up fairly easliy with a gentle rocking motion. They are fairly durable, so i wouldnt worry about destroying one by pulling it out. I would not recomend trying to clean them, or you could rub the numbers right off the tube like a dry erase marker.
In no way can you see damage or a malfunctioning tube by visual sight. You will need a good tube tester. You will need one that can test 8pin, 7pin, loktal, 9pin. novar, magnovar, compactron (14 pin). I recomend a heathkit or hickok tester from the mid to late 60s The heathkit TC-1 and TC-2 are great if they come with the adapter and booklets. A good tester will run you anywhere from 50 to 200 dollars or more.
If at all possible, try to get the sams photofact for that model TV set. This will give you detailed parts lists and adjustment instructons when you need them. Its better to fly as a newbie then fly blind alltogether.
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Jordan
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