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EF86

Sensibly equivalent to:
6267 6BK8 6F22 CV2901 Z729
See also:
Mullard's EF86 - A Low Cost Amplifier
    
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Elpico was new to us when we found a couple of valves from this company in a donated box of valves. The valve does not state the country of origin and its probable that this vendor was selling imported valves.
The box is well produced and on the end flap the price is in Shillings and so dating it to before 1971. The EF86 is the standard early stage audio pre-amplifier valve.
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 and has an attractive logo and lettering.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins, is 48 mm tall.
References: Datasheet & 1040. Type EF86 was first introduced in 1953.

 

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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