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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 original design was 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.
The valve has the later Mullard logo and is marked as imported - better than the older and pejorative 'foreign'. Our other PCL805/85 has the same logo but is of UK manufacture. That exhibit has marks inside the glass caused by use and this example looks to be unused.
On the picture it can be seen that the triode is a completely separate electrode structure with an electrostatic screen between it and the power valve.
The triode at the bottom with the screen above. Note the half mica sheet at the top of the triode.
The thin glass tube envelope is 21 mm in diameter and excluding the B9A pins is 69 mm tall.
References: Datasheet & 3002. Type PCL805/85 was first introduced in 1968.

 

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 March 13, 2015.
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