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PCF80

Sensibly equivalent to:
30C1 8A8 9A8 LZ319 LZ329
See also:
Valves and their Habits
    
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The PCF80 is from the era of VHF Band III television. Band III television in the UK began in 1955, up to that date the only program was the one BBC channel in Band I (around 50 MHz). The Band III service was the start of commercial television and moved consumer equipment to three times the previous frequency band.
The valve is a triode pentode, with separate cathodes, designed to function as a mixer and oscillator in the tuner.
The article referenced above gives details of the faults and performance of the PCF80.
Mullard also advertise the PCF80 as a video amplifier and cathode follower in a single envelope.
See also PCC84 for the corresponding pre-amplifier valve for Band III television tuners from the mid 1950s.
The end wall of the pentode. Within the anode can be seen the suppressor grid and its support.
Left is the triode, with the grid visible through the end of the anode. In the centre is the electrostatic screen. To the right, and at right angles to the triode axis is the pentode section. The shield extends above the top mica and curls round the pentode. The radiating fins on the pentode control grid can be seen on top of thier copper supports.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
References: Datasheet & 1040. Type PCF80 was first introduced in 1953.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
9
0.3
170
170
-5.5
5.2
1.5
0.87M
2.1

 

Absolute Maximum Operating Conditions
Triode
Va
Vg
mAa
100
-2
14
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 07, 2016.
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