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ME1403

Sensibly equivalent to:
CV2348
See also:
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The ME1403 is a subminiature electrometer pentode. Mullard describe the the ME1403 as having a grid current of 3 x 10 to the power -15A.
To avoid drift the filament must be heated before anode volts are applied.
Such electrometer pentodes would be used for pH meters and other critical measuring devices.
The connections are taken clockwise when looking at the underside of the base. Pin 5 is at the centre. The red spot is slightly clockwise from the anode. The base is designated B5J/F by Mullard.
Seen from the side the wire grids become clearly visible, with the anode showing as two strips at the top and bottom of the picture.
Another ME1403 from Mullard.
Looking across the grids.
The red spot is placed by the anode cnnection.
See also CV2348
The thin glass tube envelope is 10 mm in diameter and, excluding the flying leads is 43 mm long.
References: Datasheet & 4032

 

Pin Connections
B5J/F
1
2
3
4
5
f+,g3
g1
f-
a
g2

 

Absolute Maximum Operating Conditions
Pentode
Vh
Ah
Va
Vs
mAa
gm
1.25
0.0082
45
45
0.18,ra_10.5M
8-15
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 01, 2014.
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