The VX3061 is an experimental UHF disc seal triode. The connections left to right are:- anode, grid, cathode/heater and heater as centre connection.
We have no operating details for this device.
It is interesting that the successful UHF and SHF devices such as the DET22 are very similar to this early design.
The planar envelope is 14 mm in diameter and, excluding the base pins, is 60 mm tall.
Reference: Observation. Type VX3061 was first introduced in 1958.
Updated April 23, 2013.