Gas filled ballast tube designed to maintain a relatively constant current over a specified operating voltage range. Used in Zenith TransOceanics A-600, B-600 -
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Bibliographie
Ballast Tube Handbook, The
50A1: Zenith A600 schematic excerpted and redrawn
Gary Brandenburger
50A1: Zenith A600 schematic included with radio, annotated
Gary Brandenburger