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The Valvo 85A2 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.

The envelope is also marked with 0G3 indicating direct equivalence.

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.

The reverse is plain. The red tinge on the right is a hand that failed to move.

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

References: Data-sheet. Type 85A2 was first introduced in 1950. See also 1950 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.