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UCH81

Sensibly equivalent to:
10C14 19D8 X119
    
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The UCH81 is a triode heptode frequency changer for use in AC/DC mains equipment. The heater is designed for use on 100 mA heater chains. This valve would be most likely found in domestic broadcast radio receivers.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 57 mm tall.
References: Datasheet & 1040. Type UCH81 was first introduced in 1953.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2,g4
g1
k,g5,s
h
h
a
g3
a(t)
g1(t)

 

Absolute Maximum Operating Conditions
Heptode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
19.0
0.1
200
120
-2.6
3.7
8.1
1.0M
0.78

 

Absolute Maximum Operating Conditions
Triode
Va
mAa
100
13.5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 31, 2013.
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