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CV2348

Sensibly equivalent to:
5826 ME1403 VX8117
See also:
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The CV2348 is a subminiature electrometer pentode with the VX8117 as the prototype. Mullard describe the commercial version the ME1403 as having a grid current of 3 x 10 to the power -15A. This very high impedance is why the packing material states that the base of the envelope must not be touched by the fingers.
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 denotes the anode (pin 4). The base is designated B5J/F by Mullard.
The thin glass tube envelope is 9 mm in diameter, and excluding the leadout wires is 44 mm tall.
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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