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PCL86

Sensibly equivalent to:
14GW8
See also:
Valves and their Habits - New Mullard Television Valves - PCL86 & ECH84 Advert
    
Extras ▼

 

This PCL86 was made in the UK by Mullard and was designed for the audio stage of a television receiver and offered a quality output. This exhibit has the later logo indicating that this valve was made in or after 1970. See PCL86 for the older logo.
In 1961 Mullard developed a combination of an ECC83 triode and an EL84 output pentode in a single envelope and this was the ECL86. The PCL86 was the series heater chain version of that work.
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 top of the small triode is secured to a mica sheet fixed to the electrostatic screen between the sections.
The power section on the left has copper supports for the control grid and looking through the hole in the triode anode shows copper for the triode grid supports as well.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 69 mm tall.
References: Datasheet & 1040. Type PCL86 was first introduced in 1961.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g1(t)
k(t)
g2
h
h
a
k,s,g3
g1
a(t)

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
13.3
0.3
230
230
-5.7
41.0
10.5
16,000
7.5

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
13.3
0.3
230
-1.7
1.2
62,000
1.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 21, 2019.
shape:thin.glass.tube construction:all.glass type:triode.pentode age:1960.1975 base:b9a heater:300ma pins:9 pin:1.g1(t) pin:2.k(t) pin:3.g2 pin:4.h pin:5.h pin:6.a pin:7.k.s.g3 pin:8.g1 pin:9.a(t)
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