The Gammatron 24-G is a high voltage transmitting triode that produces a considerable amount of RF power up to the low VHF region and has a 25 Watt anode dissipation. It is also rated for push-pull modulator service in Class B where at 2,000 V on the anodes it can generate 110 Watts.
This valve is known as 24-G, 24G and HK24.
The cage-grid connection is taken through the side of the envelope
The anode is a bell that contains the filament and grid in a coaxial arrangement.
The wire cage grid and the helical filament within.
The wide glass tube envelope is 34 mm in diameter and, excluding the UX4 base pins, is 94 mm tall.
References: Datasheet. Type 24G was first introduced in 1944.