Mai jos este o descriere de pe "The Valve Museum".

The PL84 audio output pentode was designed for use in television receivers. Like the UL84 with a 100mA heater it is a low voltage high current version of the EL84, itself a standard in design.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.

Siemens fabricat de Valvo (Philips) la Berlin, în iunie 1964.