The 4CX600JA or 8921 is a 600 watt dissipation tetrode requiring forced air cooling. Full ratings to 110 MHz. The second example was marked with the wrong EIA number. The 8809 or 4CX600J is the same tube with a smaller diameter (2.08") anode.
Length = 2.71" Diameter = 2.52"
Max voltage = 3000
Max current = .6 amp
Fil voltage = 6
Fil current = 5.4 amps GOTO INDEX