Thread: Unisonix XL 990
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Old 07-19-2017, 11:33 AM
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jr_tech jr_tech is offline
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I would count the quarter watt and 180 mw directly heated cathode that Sony used in many portables as somewhat of an engineering break-through... then there is also the "lollipop tube":



I would guess that the engineering costs on those CRTs was significant.

jr
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