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EF70

Sensibly equivalent to:
CV467
See also:
National Electronics EF70 Box - CV467 short entry
    
Extras ▼

 

The EF70 miniature pentode has a separate connection to grid 3.
Mullard describe the EF70 as a subminiature high slope RF pentode with a short suppressor grid base. A diode is connected internally to prevent this grid locking at a positive potential.
The internal diode can be seen on top of the top mica.
The wire grids can be seen through the gaps in the anode. The diode section is to the right.
Another view through the anode to the grids.
The B8D flying lead base. Mullard state that soldering must be at least 5 mm from the seal and that any bending of the leads must be at least 1.5 mm from the seal.
The thin glass tube envelope is 9 mm in diameter, and excluding the base pins is 37 mm tall.
References:Mullard data book & 1040 Type EF70 was first introduced in 1950.

 

Pin Connections
B8D & B8D/F
1
2
3
4
5
6
7
8
g1
g3
h
k
a
h
g2
g3

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
Vg
mAa
mAs
ra
gm
6.3
0.2
100
100
-2
3.0
2.25
0.1M
2.5
Updated April 06, 2015.
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