▼ Menu

85A2

Sensibly equivalent to:
0G3 CV449 CV4048 QS1209 QS83/3
See also:
Mufax Chart Recorder Maintenance Manual
    
Extras ▼

 

The 85A2 is a small, special quality voltage stabiliser and this exhibit carries the Zaerix name but the actual maker is unknown.
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.
The thin glass tube envelope is 17 mm in diameter and excluding the B7G base pins, is 47 mm long.
References: Datasheet. Type 85A2 was first introduced in 1950.

 

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.
Updated January 10, 2016.
Return to Main Index