The 3CX3000F1 or 8239 is a 4000 watt, forced air cooled, triode with a mu of 5 and a maximum frequency of 110 MHz for full ratings.
Length = 8.60" (less leads) Diameter = 4.15"
Max voltage = 5000
Max current = 2.5 amps
Fil voltage = 7.5
Fil current = 51.5 amps
Data sheet:
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