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Hickok AC51 tube tester
#1

How does the  5W4 and 83 tube filaments get fed?


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#2

Note that no power cord, power switch, or power transformer switch are shown. That (along with my experience with full schematics for other Hickok models) would indicate that the power transformer has individual filament secondary windings (which are shown) for those tubes

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/




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