The CV2348 is a subminiature electrometer pentode. 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 from the red spot when looking at the underside of the base. Pin 5 is at the centre.

The thin glass tube envelope is 9 mm in diameter, and excluding the leadout wires is 44 mm tall.

 
Pin Connections

	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

This exhibit was last updated on 07 January 2007