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UBF89

Sensibly equivalent to:
10FD12 19FL8 WD119
    
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The UBF89 is an RF or IF amplifier pentode with two diodes sharing the common cathode.
See also EBF89.
The screen blocks the main electrodes but through the hole in the screen the wire grids can be seen.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 59 mm tall.
References: Datasheet & 1040. Type UBF89 was first introduced in 1956.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2
g1
k,s
h
h
a
a(d1)
a(d2)
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
μ
19
0.1
200
100
-0
11.0
3.3
0.3M
3.5
20
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 26, 2013.
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