File:Vintage B&K Dyna-Jet Dynamic Mutual Conductance Tube Tester, Model 707, B&K, Division Of Dynascan Corporation, Two Vacuum Tubes (6BN8 & 83), Made In USA, Circa 1966 (33021503385).jpg - Wikimedia Commons
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File:Vintage Hickok Dynamic Mutual Conductance Micromho Vacuum Tube Tester, Model 6000A, Made In USA, Circa 1967 (32144376133).jpg - Wikimedia Commons
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