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UABC80

Sensibly equivalent to:
10LD12 28AK8 DH109
See also:
FM Broadcasting and Signal Detection
    
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The UABC80 is a triple diode triode in a miniature envelope and this exhibit was made by Mullard in England with yellow lettering from the Mullard Golden Jubilee year in 1969.
The three box sections with heaters connected at the top. The triode is on the left.
This image offers a better look at the heater connections.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins, is 55 mm tall.
References: Datasheet, 3002 & 1040. Type UABC80 was first introduced in 1952.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(d3)
a(d2)
k(d2)
h
h
a(d1)
k,k(d1),k(d3)
g1
a

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
28
0.1
200
-2.3
1
50k
1.4
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 28, 2017.
shape:thin.glass.tube construction:all.glass type:triple.diode.triode age:1950.1960 base:b9a heater:100ma pins:9 pin:1.a(d3) pin:2.a(d2) pin:3.k(d2) pin:4.h pin:5.h pin:6.a(d1) pin:7.k.k(d1).k(d3) pin:8.g1 pin:9.a
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