The CV4014 is a UK service designation for the civilian M8083 or 6064, this in turn is a special quality version of the EF91/CV138. The M8083 has a more rugged build than the EF91 and was designed for operation in areas of vibration especially aircraft.
This exhibit has no obvious coating to the inner surface of the envelope and thus the inner structure is clearly visible.
The double mica sheets confer the vibration resistance. The control grid has the copper supports.
Front view of one half of the anode. The outer grids are perfectly defined. The screen grid wire sits in narrow grooves that have been opened and then pressed back over the wire. The suppressor grid winding machine clearly makes a wider groove in the support.
In this close-up the lower components can be seen. The insulated spiral heater wire and copper tape connecting electrodes to the base pins.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Data-sheet & 1040. Type CV4014 was first introduced in 1953.