The 504R is a forced air cooled, 1000 watt, triode with a mu of 17 and a maximum frequency of 150 MHz made by Amperex.
Length = 5.55" Diameter = 2.50"
Max voltage = 3500
Max current = .86 amp
Fil voltage = 7.5
Fil current = 24 amps
Data sheet:
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