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PCF801

Sensibly equivalent to:
8GJ7
See also:
Valves and their Habits - PCF801
    
Extras ▼

 

The PCF801 is a VHF television mixer oscillator. Triode pentode combinations worked better at high frequencies than hexode mixers.
As the PCF801 was designed for use in the dual standard sets of the mid 1960s the vari-μ pentode can also be employed as an IF amplifier following the UHF tuner.
In the UK BBC2 opened in April 1964 as a 625 line transmission on UHF (470 - 860 MHz) totally incompatible with the 405 line BBC1 and ITV programs on VHF. Dual standard sets had a long slide switch that changed the circuit configuration between the two standards.
The triode is small compared to the pentode on the right. The top mica looks to be double thickness.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 41 mm tall.
Reference: Data-sheet. Type PCF801 was first introduced in 1963.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
8.5
0.3
175
120
-1.4
10
3.0
0.35M
5.0

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
60
12
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 23, 2021.
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