Type 8012 is a VHF/UHF transmitting triode. The 8012 appeared in 1942 and has a thoriated tungsten filament as did the earlier 1628.
The control grid can pass up to 14 mA grid current and dissipate 1.6 W. The maximum frequency of operation is in the region of 500 MHz. The 8012A is rated at full power at 500 MHz.
This exhibit is unused and lacks the black gettering seen in 8012. The plate that holds the getter material is present on the left of the image and their is a feint colour to the glass above the plate. It could be that this valve was pumped to a high vacuum and minimal gettering used.
The RCA logo, Type 8012 and Made in USA are etched into the glass.
The underside of the getter holding plate showing the support held in the top pinch. The sealed-off evacuation tube can be seen top right.
An enhanced image to show the grid and filament within the lower end of the anode. The tape connections from the side pins to anode (top) and grid (lower) are seen welded to the three part connecting pins.
The thin glass tube envelope is 26 mm in diameter and, excluding the base wires, is 90 mm tall.
References: Datasheet & 3002. Type 8012 was first introduced in 1942.