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This exhibit is the English Electric BW1102J2 the J2 referring to the water jacket that is permenently attached to the anode of the valve.

The BW1102J2 has a thoriated tungsten filament and an anode dissipation of 20 kW. The maximum frequency of use is 50 MHz.

The attached PDF is of the 1970 English Electric Triode data book. The file is over 38 MB in size.

The brass filament connections and within the glass the copper cone connecting the grid ring to the actual grid.

The J2 integral water jacket with mounting flange. Internally the anode is made of copper.

The wide glass tube envelope is 154 mm in diameter, and including the base pins is 473 mm tall.

Reference: Data-sheet pp137ff. Type BW1102 was first introduced in 1955. See also 1955 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.