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PCF80

Sensibly equivalent to:
30C1 8A8 9A8 LZ319 LZ329
See also:
Valves and their Habits - VHF Valves Advert, March 1954 - PCF80 Advert, April 1954 - PCF80 Advert, August 1955
    
Extras ▼

 

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. The Band III service was the start of commercial television.
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 yellow/gold paint was used for the 50th anniversary of the company in 1969.
The pentode on the left with the screen between it and the triode on the right..
This view is looking straight at the triode, again the screen is the plate behind.
With the screen on the left we see here the triode end elevation.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
References: Data-sheet & 1040. Type PCF80 was first introduced in 1953. See also 1953 adverts.

 

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 July 26, 2023.
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