The PCF82 is a television frequency changer from the VHF television era. Each section has its own cathode brought out to a pin. The pentode voltage rating is higher than the PCF80.
Although quoted as a pentode the actual construction is as a beam tetrode and the beam plate can be seen within the open end wall of the anode.
The small triode (left) is separated from the pentode by an electrostatic screen.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 50 mm tall.
References: Data-sheet & 1040. Type PCF82 was first introduced in 1953. See also1953 adverts.