Quote:
Originally Posted by wa2ise
I vaguely remember, on my grandma's set above, that the horiz output tube had a circular spiral spring like thing around its middle. Don't know what it was there for. Think it was made of steel, possibly magnetic.
I'm pretty sure my grandma's set had no zoom feature.
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That ring around the output tube was placed there because of a complaint of Barkhausen oscillations in the tube. One or more undesired vertical black lines would show up on the screen--usually on the left side. Generally replacement of the horizontal output tube was indicated, but some TV repairmen had luck in suppressing these spurious oscillations by attaching a "beam bender" magnet array usually applied to a CRT neck on earlier sets. The bender ring would be turned around and up and down the envelope of the HOT until the undesired lines--sometimes called "snivets" by the trade--would disappear.