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UBC81

Sensibly equivalent to:
10LD13 DH119
See also:
Mullard UBC81 Box
    
Extras ▼

 

The UBC81 small double diode triode was designed for signal demodulation and AGC detection in universal mains domestic equipment. This example clearly shows that it was made by Philips
The triode section would be used for a first stage of amplification after the detection process.
Looking through the screen, one can see the grid and the copper supports.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 55 mm tall.
References: Datasheet & 1040. Type UBC81 was first introduced in 1954.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
gm
μ
14
0.1
250
-1.5
5.0
1.65
70
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December24, 2012.
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