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EBC81

Sensibly equivalent to:
6BD7 6BD7A 6LD13 EBC80
    
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The EBC81 is a double diode triode with the triode designed for audio amplification. The diodes share the same cathode as the triode and would be used for signal detection and AGC rectification. This exhibit was made in Holland by Philips.
The screen obscures the inner detail. The triode is at the top with the diodes below. The triode anode is a bright plate on only one side of the cathode.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 52 mm tall.
References: Datasheet & 1040. Type EBC81 was first introduced in 1954.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.23
250
-3.0
1.0
58,000
1.2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 28, 2017.
shape:thin.glass.tube construction:all.glass type:double.diode.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.a(t) pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.a(d1) pin:7.s pin:8.a(d2) pin:9.ic
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