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| CV1553Sensibly equivalent¶ to:ESU450X VT4B | 
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 |  | The CV1553 is a directly heated transmitting triode with a 450 Watt anode dissipation. The old RAF service code is VT4B.Reference: Data-sheet. | 
 |   Absolute Maximum Operating Conditions¶
|  | Vh | Ah | Va | | 
 | 18.0 | 5.15 | 5,000 | 
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 Updated October 23, 2017. |  |