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Before instant-on, sets took about 25 seconds to make a recognizable picture. Instant-on was a feature for consumers,a nd could get a picture in a couple of seconds, depending on how hot the tube were kept - but anathema to the Energy department and EPA. When sets went solid state and fast-heating CRT cathodes were developed, instant-on was dropped, and typical picture turn-on went to 12 seconds or so.
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