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EF85

Sensibly equivalent to:
6BY7 6F19 6F26 CV1375 W719
    
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The EF85 is described as a VHF varible-mu pentode. Clearly this places the valve in a superhet context with AGC applied to the RF and IF sections. It was a television valve and the frame grid EF183, released in 1962, overtook its performance.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 60 mm tall.
References: Datasheet & 1040. Type EF85 was first introduced in 1951.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
k
g1
k
h
h
s
a
g2
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-2.0
10.0
2.5
0.5M
6.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated February 23, 2013.
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