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UF41

Sensibly equivalent to:
121VP 12AC5 W142
    
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The UF41 from Mullard is a vari-mu amplifier pentode. Use was for AGC controlled RF and IF amplification in superhet receivers.
The thin glass tube envelope is 19 mm in diameter and, excluding the B8A base pins, is 53 mm tall.
References: Datasheet & 1040. Type UF41 was first introduced in 1947.

 

Pin Connections
B8A
1
2
3
4
5
6
7
8
h
a
ic
ic
g2
g1
k
h

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
12.6
0.1
170
100
-2.5
6.0
1.75
0.9M
2.3
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 22, 2013.
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