The 3C24 is a small American transmitting triode. This exhibit also carries the American service code VT-204 and is also known as the HK24. A larger version exists as the HK54
In spite of its small size it produces a considerable amount of RF power up to the low VHF region.
The anode is a bell that contains the filament and grid in a coaxial arrangement.
The UX4 base pins. These are solid pins as the bayonet base has springs that the pins slide sideways into.
The Helical thoriated tungsten filament with a cage grid of vertical wires surrounding it.
The Norelco stylised name. This brand belongs to North Americal Philips.
The wide glass tube envelope is 35 mm in diameter and, excluding the UX4 base pins, is 92 mm tall.
References: Data-sheet. Type 3C24 was first introduced in 1945. See also1945 adverts.
