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Old 09-11-2019, 11:36 AM
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bandersen bandersen is offline
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Join Date: Mar 2009
Location: Chicago, IL
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An 83 can glow blue during normal operation but generally just down inside the plate structure.

83 draws 3A filament while an 80 is 2A. Also 83 has a lower voltage drop across the plates and generates more electrical noise. So it's not a drop in replacement but can sub for an 80 in some cases.
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