Wow, fabulous detail! All I knew about degaussing was when I pressed my computer monitor button and the screen boinged. You've explained the procedures I need to follow for the degaussing of the gaussed set.
One question: Does the shadow mask only apply to color sets? I figure that's the case, since we're talking about color.
I ask, because I was going to have another customer ask my main character Hunny (Gil 'Hunny' Hunnicutt) move her teevee set. This would be after he put in a wave-trap for an interference problem. She has rabbit ears, so I'd have him suggest an antenna, which he'd wire up through closets to her attic. (She finds outdoor antennae to be 'tacky'.) The mayhem of the story will happen with this customer who'll be kidnapped by an Albanian hit man in drag and the husband won't pay ransom. (Uh, it's not based on a true story.)
As for the links, something is automatically doing that. I didn't link compooter monitor either!
Quote:
Originally Posted by old_coot88
OK, the vacuum cleaner motor puts out a strong magnetic field which can magnetize the shadow mask in the pic tube. This causes the three electron beams passing through the shadow mask to incorrectly 'register' when they land. That is, they don't land perfectly on the correct phosphor dots, and partially illuminate the adjacent dots. This screws up the color purity. (For example, an all-red screen will have blotches of the wrong colors in it.)
The shadow mask can thus be said to be "gaussed" by the vacuum cleaner (or any other source of a magnetic field).
DEgaussing is done to restore the purity. It's done with a tool called a degaussing coil. It's a hoop about a foot in diameter with a momentary contact push-on button and a long cord that plugs into AC. There's a special technique (NOT the one shown in the UTube video !!!!!!). The coil is switched on while at least 6 feet away from the TV set. The coil is slowly brought in to the CRT face and moved around, and around the sides and top of the TV, then slowly moved back at least 6 feet away from the set before switching the coil off. If the coil is switched off while close in, it will "gauss" the CRT instead of degaussing it. (Also in the UTube vid, the guy switches the coil on directly in front of the CRT. Wrong!)
In the days before auto-degaussing (which didn't come until the CTC-16), the sets had to be degaussed every time they were moved, or even rotated 90 degrees, because even the Earth's magnetic field would disturb the purity.
Dang, dunno why "the vacyoom cleaner" got formatted in blue.  T'warnt me did that.  |