The RK46 is a pentode power amplifier that can also be used as a power oscillator. The RH46 has full rating up to 30 MHz and a maximum working frequency of 60 MHz.
The RK23 differs only in as much as it has a 2.5 Volt filament. The RK46 has a thoriated tungsten filament.
Typical operation would see the RK46 generate 64 Watts of RF.
The box anode is stitched together and the supports are threaded through. The anode connection has a pinch to hold the supports and a collar around the pinch stem.
The box anode is open enough for the three wire grids to be visible.
In this close-up the form of the wire grids can be seen. The filament tension springs are at the bottom of the image.
An enhanced view showing the control grid passing across the filament parallel to the anode. The screen grid appears to be aligned to the control grid and thus minimising screen grid current.
The UX5 base. The data-sheet describes the base as being made from Isolantite. De Forest used Isolantite for his early valves such as the DV-2.
The wide glass tube envelope is 51 mm in diameter, and excluding the UX5 base pins is 195 mm tall.
Reference: Data-sheet. Type RK46 was first introduced in 1938. See also1938 adverts.
