The VT-146 is a variable μ RF pentode for dry battery operation. The design is American and the VT-146 designation shows that it was a design supplied to the US military. The commercial equivalent 1N5GT is present on the valve. This valve was used at both RF and IF in superhet receivers.
The outer solid screen hides the inner electrodes.
The top of the screen.
The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 67 mm tall.
