The RK-35 is an RF power triode. The data-sheet states that the anode and control grid are made of tantalum and the base ceramic is Isolantite.
The amplification factor is nine and the maximum anode dissipation is 50 Watts. The operating frequency is designed to be between 60 and 120 MHz and the output power in Class C is up to 120 Watts.
The Raytheon logo on the base cap as well as Made in USA.
The anode connects at the top and the control grid is brought out to a side cap.
The cage grid is covered at the top. Within a central support holds the helical thoriated tungsten filament that doubles back on itself to form a double helix.
The lower end of the cage grid. The rods are fixed together with an open pitch helical wire wound on the outside of the cage.
The balloon envelope is 59 mm in diameter and, excluding the UX4 base wires, is 136 mm tall.
References: Data-sheet. Type RK-35 was first introduced in 1938. See also1938 adverts.
