The PCL86 was designed for the audio stage of a television receiver and offered a quality output. The design is the 300 mA heater version of the ECL86 and TV sets of the time had no mains transformers the HT was limited to the incoming mains.
The separate triode section would provide the first audio amplification, and the output pentode would drive the loudspeaker.
The PCL86 as a single ended audio amplifier would have a cathode resistor of 125 Ω and an anode load of 5,100 Ω and under these conditions would produce an output power of 4.1 Watts at a distortion of 10%.
The triode on the right is screened from the output section. The design features a half mica part way along the length of the output section.
Face view of the triode with the bright screen behind.
The construction is as a beam tetrode and the bright beam plate can be seen just inside the anode.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.
References: Data-sheet & 1040. Type PCL86 was first introduced in 1961. See also1961 adverts.
