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EF86

Sensibly equivalent to:
6267 6BK8 6F22 CV2901 Z729
See also:
Mullard's EF86 - A Low Cost Amplifier
    
Extras ▼

 

The EF86 is the standard early stage audio pre-amplifier valve and superceeded the EF40.
The Mullard EF86 is the definitive expression of this Mullard design. This exhibit is one of the many copies that other manufacturers have made over this valves long life.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
References: Data-sheet & 1040. Type EF86 was first introduced in 1953. See also 1953 adverts.

 

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

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vg
mAa
ra
gm
6.3
0.2
250
-5
4
2.5M
2
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 29, 2013.
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