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PCL84

Sensibly equivalent to:
15DQ8
See also:
Valves and their Habits
    
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The PCL84 is a television triode and output pentode mainly for use as a video output stage. For this wideband amplifier service a high mutual conductance is required and here the gm is 9.5 mA/V
The triode on the left and the pentode at right angles to it on the right. It can be seen to be a true pentode by the three grid support rods extending beyond the mica supports.
The pentode with glass discolouration that looks like a copper deposit. The wording is Made in England.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins it is 59 mm tall.
References: Datasheet & 1040

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pdiss
15
0.3
220
220
-3.3
18
3.2
0.15M
9.5
4.0W

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
ra
gm
200
-1.7
3
16.2k
4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated March 24, 2014.
shape:thin.glass.tube construction:all.glass type:triode.pentode age:1950.1960 base:b9a heater:300ma pins:9 pin:1.g1(t) pin:2.a(t) pin:3.k(t) pin:4.h pin:5.h pin:6.a pin:7.k.g3.s pin:8.g1 pin:9.g2
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