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EF86

Sensibly equivalent to:
6267 6BK8 6F22 CV2901 Z729
See also:
Teonex EF86 Box - A Low Cost Amplifier - High Quality Audio Amplification
    
Extras ▼

 

The EF86 is the standard early stage audio pre-amplifier valve.
The EF86 is a low noise pentode intended for use as a RC coupled AF voltage amplifier, particularly in the early stages of high gain audio amplifiers, microphone pre-amplifiers and magnetic tape recorders.
The screen is dimpled and not perforated.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
Reference: 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 May 22, 2014.
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