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CV686

Sensibly equivalent to:
0C3 QS1206 VR105/30
    
Extras ▼

 

The CV686 is a cold cathode voltage stabiliser. This valve will stabilise the voltage across it to 105 Volts for output currents between 5 mA and 30 mA. To strike the tube the voltage must exceed 135 V.
As with all such stabilisers the voltage will vary slightly with the current drawn. For this tube the stabilisation is 4 Volts across the current range.
If used as a reference within a stabilised power supply the stabiliser tube would be run as close as possible in constant current mode, i.e. with a fixed load and controlling the voltage on the control grid of the amplifier within the power supply.
Pins 3 and 7 are linked internally and can be used to allow voltage to the controlled circuit only when the stabiliser is in place.
The reverse has the STC logo and the commercial designations of VR105/30 and 0C3.
The wide glass tube envelope is 38 mm in diameter and, excluding the IO base pins, is 90 mm tall.
References: Data-sheet & 1040. Type CV686 was first introduced in 1939.

 

Pin Connections
IO
1
2
3
4
5
6
7
8
-
k
ic
-
a
-
ic
-

 

Absolute Maximum Operating Conditions
Stabiliser
Va
mAa
105
40.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 18, 2021.
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