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The BW1143 is the closest match we can find for this English Electric cooled anode triode. The weight and dimensions fit the data sheet. However the valve has lost the Type designation information.
The maximum anode dissipation for the water cooled version is 30 kW and the RF output is up to 77.7 kW with full frequency ratings of 10 MHz.
Full details are available in the attached PDF book. The file is 38 MB in size.
The top of the triode with copper filament connections and showing the chromium plated anti-corona rings.
The top of the valve. The grid connection is the short wide cylinder that the the top anti-corona ring is bolted to.
Without the water jacket the shape and size of the copper anode can be seen together with the glass to metal seal.
The detachable water jacket. At full load some 30 litres of water at no more than 20 °C are required to flow through this water jacket each minute.
Thanks to Frank Reid for sending in these excellent images.
The wide glass tube envelope is  mm in diameter, and excluding the base pins is  mm tall.
Reference: Data-sheet pp221ff.


Absolute Maximum Operating Conditions
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated August 04, 2016.
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