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EF86

Sensibly equivalent to:
6267 6BK8 6F22 CV2901 Z729
See also:
A Low Cost Amplifier
    
Extras ▼

 

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.
This Zaerix branded example has a perforated metal outer screen.
The screen is formed into a cylinder and the joining mechanism is hard to see.
The thin glass tube envelope is 21 mm in diameter and, excluding the B9A base pins, is 48 mm tall.
Reference: 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 June 12, 2024.
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