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ID = 58716
Tube type:  Transmitting Tetrode, air cooled   UHF 
Identical to 8561 = 4CX300Y
Similar Tubes
Different maximum ratings:

Base SPECIAL TUBEBASE in general
Filament Vf 6 Volts / If 3.5 Ampere / Indirect
Description Forced air cooling ceramic tetrode capable of operation up to 500MHz. Breech-block base; special socket required, Eimac SK-200 or equivalent.
Similar to 4CX300A/8167 uprated to 400W. 
Dimensions (WHD)
incl. pins / tip
42 x 62 x mm / 1.65 x 2.44 x inch
Weight 95 g / 3.35 oz
Information source Tube Lore (I)   
8561: Private collection
Emilio Ciardiello


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