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5687

Sensibly equivalent to:
5687WA 5687WB CK5687 CV2578
    
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The 5687 is a special quality double triode. It is described as a general purpose medium gain triode pair with good emission. The pair can dissipate 7.5 Watts or a single triode can dissipate 4.2 Watts.
The picture clearly shows the pair of flat cathodes at the top, with the copper grid supports either side of each cathode. The anodes are shaped and blackened.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 45 mm tall.
References: Datasheet & 3002. Type 5687 was first introduced in 1956.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
a(2)
g1(2)
k(2)
h
h
k(1)
g1(1)
hct
a(1)

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
μ
6.3
0.9
300
-12.5
12.0
3,000
5.4
16
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 26, 2016.
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