The DET24 could be used as an oscillator or amplifier and could produce up to 10 Watts at up 2 GHz.
This exhibit has the Type designation written on the label. It also has a pointed top unlike DET24 that has the top of the envelope pressed in to form a re-entrant shape.
The central ring is the grid connection. The grid proper will be fine wires stretched across the central disc. The cathode and anode are placed either side of the grid and in very close proximity to it.
The heater connections are co-axial as this valve was designed to be enclosed in resonant cavities.
Robert Coleman lent this assembly for photographing. It is a DET24 with most connections in place. The anode ring is clamped between sheets of copper. The grid connections are missing. The cathode connection is a copper P clip. The heater connection at the tip slips over the pin and has a solder tag for the lead. The whole arrangement is secured to a pasteboard rectangle.
The anode connection also forms the heatsink.
The anode within the outer copper cylinder.
The heater/cathode and heater connections.
Within the valve: the anode is at the top set close to the grid disc.
The planar envelope is 20 mm in diameter, and including the base pins is 65 mm tall.