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ECC85

Sensibly equivalent to:
6AQ8 6L12 B719
See also:
Valves and their Habits
    
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This exhibit is a Russian military specification version of the ECC85. The ECC85 design was specifically aimed at VHF receiver front ends.
The cyrillic can roughly be transcribed as 6H2n-EB. The feint logo looks like a rocket on its side.
The triode sections are made more substantially than the commercial versions. (See ECC85).
The two independent valves are screened by a rectangular plate across the diameter of the envelope. One triode would be used as an RF amplifier and the other as the local oscillator. The for Band II operation, the oscillator would be run 10.7 MHz lower than the incoming signal, and in the mixer a standard 10.7 MHz IF would be produced. The lettering visible is OTK7.
The face view of one anode showing the anode side flanges for fixing.
The thin glass tube envelope is 22 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
References: Datasheet & 1040. Type ECC85 was first introduced in 1954.

 

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

 

Absolute Maximum Operating Conditions
Triode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.435
250
-2.3
10
9700
5.9
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 10, 2014.
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