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UF89

 
See also:
EF89 & UF89 Advert.
    
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The UF89 is an internally screened variable μ pentode designed for VHF applications in Band I and Band III televisions. It is a low impedance device and would have found application in receiver front ends.
The main picture shows the suppressor grid clearly and the much finer pitch screen grid can just be seen.
Through the screen the width of the anode can be just made out.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A pins is 53 mm tall.
References: Data-sheet & 1040. Type UF89 was first introduced in 1955.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
12.6
0.1
170
110
-2
12
3.9
0.525k
3.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 30, 2021.
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