In electronics, a "hot" component is one that has been modified or selected for higher-than-standard output. An could be a vacuum tube or transistor that draws more current, a laser diode with a higher mW rating, or a sensor with boosted sensitivity. The "1" likely denotes the first revision of this hot modification—the rawest, most aggressive version before later revisions (1 Hot, 2 Hot, etc.) tamed the specs for safety.
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