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PC86

Sensibly equivalent to:
4CM4
See also:
Valves and their Habits - The PC97 Tutorial - Mullard Triodes for UHF Tuners - PC86 and PC88 Advert - Valves for Dual Standard TVs
    
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The PC86 is a purpose designed UHF oscillator triode for television reception. Mullard describe the PC86 as: a UHF frame-grid mixer/oscillator triode.
The item of note is that the logo is the later Mullard style and the manufacture is described as imported. This is much better than the earlier marking of imported valves as 'foreign'. Foreign was used when we in the UK were asked to believe that British was best and so the term foreign always had the connotation of inferior.
The small anode end view. The width is 5 mm. In the tutorial referenced above is a diagram of the re-entrant anode.
The working faces of the anode are very close to the grid with the heat radiating portions much further away.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 47 mm long.
References: Datasheet & 1040. Type PC86 was first introduced in 1962.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a
g1
k
h
h
g1
k
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
3.8
0.3
175
-1.5
12
4850
3.6
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated September 07, 2016.
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