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PCL805/85

Sensibly equivalent to:
PCL805 PCL85
    
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The PCL805/85 triode pentode was purpose designed as a domestic television receiver frame output stage. The design was originally the PCL85 and was improved to the PCL805. The designation PCL805/85 just indicates the interchangeability rather than another design.
As is common with TV valves it is designed to operate at a relatively low voltage and high current as valve based TV receivers operated without mains transformers. The beam tetrode has a quoted load resistance of 4,000 Ohms.
The literature quotes an audio output rating for the PCL805 but this was not the case for the earlier PCL85. In any case the valve of choice for audio output was the PCL86.
This valve has seen action as can be seen by the discolouration of the glass opposite the holes in the end of the anode.
The triode is separated from the output pentode by an electrostatic screen.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A pins is 69 mm tall.
References: Data-sheet & 3002. Type PCL805/85 was first introduced in 1968. See also 1968 adverts.

 

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

 

Absolute Maximum Operating Conditions
Tetrode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
Pout
18
0.3
170
170
-15
41
2.3
25k
7.5
3.4W

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
ra
gm
100
0
10
8300
1.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 28, 2017.
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