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CV2349

Sensibly equivalent to:
EN30
    
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The CV2349 is a miniature thyratron. The literature gives its commercial equivalent as an EN30. The Ferranti EN30 does not follow the Philips/Mullard naming convention and thus the 3 does not refer to an IO base as 1040 says.
This is a cold cathode device, and the cathode is treated with caesium compounds to give high emission capabilities. The anode voltage ranges from 250 Volts as a working voltage to 400 Volts maximum. The maximum inverse voltage across the tube is 350 Volts. The valve has two trigger electrodes and the static voltage difference between them is to be in the range 80 - 130 Volts. The thyratron is a pulse generator and this valve has a maximum average current of 50 mA, but the maximum current at the maxima of the pulse can rise to 250 Amps.
Prior to triggering the valve one trigger is held at a fixed positive potential and the other is held negative. As the negative electrode is taken positive the discharge is ignited. The valve is neon filled and the pulse is accompanied by a red flash from the thyratron.
The long (23 mm) gap to the anode suggests the need for good insulation.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 62 mm tall.
References: Datasheet & 1040.

 

Pin Connections
B7G
1
2
3
4
5
6
7
tc
tr(1)
ic
ic
k
k
ic
tr(2)
a

 

Absolute Maximum Operating Conditions
Thyratron
Va
mAa
400
50
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 12, 2013.
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