General Characteristics min typ max Heater Voltage (AC or DC) 5.7 6.3 6.9 V Heater Current @6.3V 0.9 A Cathode: oxide-coated, unipotential Cathode-to-heater potential ±200 V Direct interelectrode capacitances : Grid no. 1 to plate 0.6 pF Grid no. 1 to cathode, heater, grid no. 2, and beam forming plates 10 pF Plate to cathode, heater, grid no. 2, and beam forming plates 6.5 pF Mechanical Operating position Any Base Large wafer octal 8-pin Basing diagram JEDEC 7AC Cooling Radiation and convection Envelope temperature (max) 250 C Nominal dimensions: Diameter 38.8mm (1.528 in.) Base to top 93mm (3.605 in.) Overall height 108mm (4.252 in.) Diameter of base 34mm (1.339 in.) Net weight 65 grams Maximum ratings DC plate voltage VP 500 V Screen grid voltage Vg2 500 V Plate Dissipation 30 W Screen Grid Dissipation 5 W