The CV2394 data-sheet says the design had the commercial DA42 as the prototype. As this valve carries both Type designations it is clear that the two are identical.
The CV2394 is an indirectly heated audio power triode with an anode dissipation of 40 Watts. It was designed for use as a push-pull pair in Class B to give 175 Watts out with 1kV on the anodes. The earlier DA41 has a directly heated thoriated tungsten filament and carbon anode. The DA42 is a posr-war re-design of the DA41 using modern materials and manufacturing techniques.
The GEC label. Earlier CV valves had no maker's identification.
The anode is a rectangular box made of folded and carbonised nickel. Each side is made of two L shaped pieces stitched together. The end caps are folded with the ends forming the extra side wings.
The rectangular cathode tube can be seen in the centre of the top mica sheet. The control grid supports are topped with large radiating fins.
A closer view of the anode construction clearly showing how it is formed.
This exhibit is new and came in a plain cardboard box with a GEC label on the side. The valve was held by a roll of corrugated card.
The classic envelope is 50 mm in diameter, and excluding the UX4 base pins is 132 mm tall.