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EF86

Sensibly equivalent to:
6267 6BK8 6F22 CV2901 Z729
See also:
Mullard's EF86 - A Low Cost Amplifier - High Quality Audio Amplification - Made for Music Advert - Audiophiles Advert - EF86 Pre-Amplifier Valve Advert - 15 Watt DC/AC Amplifier Advert - Noval Based Valves for Audio Amplifiers Advert - Valves at the 1953 Show
    
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The EF86 is the standard early stage audio pre-amplifier valve. This exhibit was made by Mullard who designed the EF86. Mullard describe the EF86 as 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 exhibit has a plain bright outer screen whereas most EF86 examples have a perforated electrostatic outer screen.
The hole in the screen reveals the grid axis and all three wire grids.
The bright screen
The thin glass tube envelope is 20 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 December08, 2015.
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