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EBF89

Sensibly equivalent to:
6DC8 6FD12
See also:
Valves and their Habits
    
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The EBF89 features two signal diodes and a variable μ pentode in the one envelope and sharing a common cathode.
The variable μ characteristic is indicative of a device designed to have its gain controlled by an AGC system. This places this valve in service as a final IF amplifier and detector. The high impedance of the pentode supports the case for use with a tuned circuit connected to the anode.
Through the hole in the screen the three wire grids are visible. The cathode tube passes through the top mica without any coating. Above the top mica the tube is coated again and either side are the diode anodes.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 59 mm tall.
References: Datasheet & 1040. Type EBF89 was first introduced in 1958.

 

Pin Connections
B9A
1
2
3
4
5
6
7
8
9
g2
g1
k,s
h
h
a
a(d1)
a(d2)
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.3
250
100
-2
9
2.7
1M
3.8
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated December20, 2017.
shape:thin.glass.tube construction:all.glass type:double.diode.pentode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.g2 pin:2.g1 pin:3.k.s pin:4.h pin:5.h pin:6.a pin:7.a(d1) pin:8.a(d2) pin:9.g3
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