The CV449 is a small, special quality voltage stabiliser. The striking voltage is 115 Volts and the maintaining voltage is 85 Volts. For a tube current variation of 1 mA to 10 mA the voltage regulation is 4 Volts.

This valve would have been used to directly stabilise the voltage for an oscillator or be employed as a voltage reference for a stabilised supply. In the latter case the tube would be operated at constant current.

See Mullard 85A2 for the commercial version.

The thin glass tube envelope is 17 mm in diameter and excluding the B7G base pins, is 46 mm long.

References: Datasheet.

 
Pin Connections

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

 
Absolute Maximum Operating Conditions^¶

Stabiliser	Va
	85

Thanks to Frank Philipse for supplying the above PDF datasheet