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6267

Sensibly equivalent to:
6BK8 6F22 CV2901 CV4086 EF86 Z729
See also:
A Low Cost Amplifier - High Quality Audio Amplification
    
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The 6267 is Tungsram's special quality implementation of the EF86. This signal pentode became the standard early stage audio pre-amplifier valve after it replaced the EF37A octal 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 types have a perforated electrostatic outer screen.
Looking through the hole in the screen all three wire grids can be seen. The anode also looks to be cylindrical.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 49 mm tall.
Reference: Data-sheet & 1040.

 

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 July 10, 2020.
shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.g2 pin:2.s pin:3.k pin:4.h pin:5.h pin:6.a pin:7.s pin:8.g3 pin:9.g1
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