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CV2487 / 4X250B tetrode This valve measures 64x42mm overall and has a special 9-pin base (the spigot is pin 9) Heater voltage 6V Heater current 2.6A Max grid voltage -250V Max control grid dissipation 2W Max screen dissipation 12W Max anode temperature 250°C Max base seal temperature 175°C Max frequency 500MHz Min cathode heating time 30s Class AB audio Max anode voltage 2kV Max anode dissipation 250W Max anode input 500W Max anode current 250mA Max screen voltage 400V Class C telephony Max anode voltage 1.5kV Max anode dissipation 165W Max anode input 300W Max anode current 200mA Max screen voltage 300V Class C telegraphy Max anode voltage 2kV Max anode dissipation 250W Max anode input 500W Max anode current 250mA Max screen voltage 300V Capacitances Cin (nom) 15.7pF Cout (nom) 4.5pF Ca-g1 (max) 0.06pF Pin Function 1 Screen grid 2 Cathode 3 Heater 4 Cathode 5 i/c 6 Cathode 7 Heater 8 Cathode Spigot Control grid Main body Anode

This file was last modified23:10:23, Wednesday February 23, 2022