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PCC189

Sensibly equivalent to:
7ES8
See also:
Valves and their Habits
    
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The PCC189 is a low impedance high gain double triode. The technical specification specifically states that it is built with frame grids. The valves are variable μ types for use at RF as AGC controlled devices. The low voltage high current suggests a low noise design, probably as the front end stages in a television tuner. The low anode voltage suggests both stages used as a cascode (series connected) amplifier.
See PCC88 for the single μ or straight version.
The triode sections appear as separate structures. The anode is significantly larger than is found in most double triodes. The size and the blackening of the anode all point to these being run at significant current.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins it measures 46 mm long.
References: Datasheet & 1040. Type PCC189 was first introduced in 1960.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
7.6
0.3
90
-1.4
15
2500
12.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 23, 2013.
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