The CV4028 gas discharge voltage stabiliser is the UK Government version of the commercial 0B2WA B7G voltage stabiliser and both designations appear on the envelope indicating a direct equivalence.

The regulation of this tube was 3 Volts for currents of between 5 and 30 mA. The CV4028/0B2WA is a special quality version of the commercial 0B2 and the regulation is tighter at 3 volts. The CV1833 is the CV version of the 0B2.

The striking voltage for the 0B2WA is 133 volts.

The thin glass tube envelope is 19 mm in diameter and, excluding the B7G base pins, is 58 mm tall.

 
Pin Connections

B7G	1	2	3	4	5	6	7
	a	k	ic	k	a	ic	k

 
Absolute Maximum Operating Conditions

Stabiliser	Va	mAa
	108	30

Thanks to Frank Philipse for supplying the above datasheet

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This exhibit was last updated on 07 November 2007 {find valves by name}