1950s Sylvania 2A3 Power Triode Tube - Hickok KS-15750-L1 tested
Western Electric KS-15750-L1 (very similar to Hickok 539B). Tube features gray-plates and duo bottom-mounted 'Rectangular' getters construction. Date Codes Test Result (Gm). FantasticTubes 🎷 🎶.