The 7586 was the first production Nuvistor type and was introduced in 1959. This exhibit is a pair of unused devices within the original packaging.
The Nuvistor from RCA was a form of triode for use at VHF and built into a metal case just larger than a transistor. The base is ceramic sealed to the metal case and five fine pins, on a 12 pin grid, form the connections and the electrode supports internally. A special base is required.
The Nuvistor is built as a series of co-axial electrodes but they are all very small, and small inter electrode capacitances result. Thus the high frequency of operation. Unlike the transistors of the time the Nuvistor had the overload and intermodulation characteristics of the valve, which were superior to the transistors of the day.
The pins are protected by the extended case, that also acts as a guide into the base for the fragile pins.
The packaging is a cardboard sleeve protecting an expanded polystyrene carrier.
The two valves are a push fit in the soft plastic.
The thin metal tube envelope is 10 mm in diameter and, excluding the base pins, is 20 mm tall.
Reference: Datasheet. Type 7586 was first introduced in 1959.