The PL83 was designed as a sensitive video amplifier valve for television receivers.
This exhibit is branded Pinnacle and was an import to the UK at the time when British made was considered superior. The pejorative term foreign has been added to the glass.
This exhibit is new old stock and shows the pristine envelope not marked by years of electron bombardment.
This is a true pentode and the outer two grids can be seen through the hole in the anode.
The insulation is enhanced by the ceramic spacers placed top and bottom.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 69 mm tall.
References: Data-sheet & 1040. Type PL83 was first introduced in 1951. See also1951 adverts.
