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9A8

Sensibly equivalent to:
30C1 30C1 8A8 LZ319 LZ329 PCF80
See also:
Valves for Bands III, IV & V - Valves and their Habits
    
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The 9A8 is from the era of VHF television in the 1950s and early 1960s. The valve is a triode pentode with separate cathodes, designed to function as a mixer and oscillator in the tuner front end.
The bright screen separates the two sections with the triode on the right. The triode has copper grid supports.
Face view of the triode with stitched anode. The screen is larger in size than the triode to screen it completely.
The pentode section.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 48 mm tall.
References: Data-sheet & 1040

 

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 September 16, 2020.
shape:thin.glass.tube construction:all.glass type:triode.pentode age:1950.1960 base:b9a heater:300ma pins:9 pin:1.a(t) pin:2.g1 pin:3.g2 pin:4.h pin:5.h pin:6.a pin:7.k.s.g3 pin:8.k(t) pin:9.g1(t)
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