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The 2SD822 seems slightly weaker than the 2SD517. For instance, the 2SD517's maximum Collector-Emitter Voltage is 700v, whereas 2SD822's is 600v.
However, a 13" CRT is pretty small. The 2SD517 datasheet says it's "Designed for use in large screen color deflection circuits". Did the designers of the CT-1310M use a better rated HOT than necessary?
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