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CV3798

Sensibly equivalent to:
0A3 QS1205 VR75/30
    
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The CV3798 is a 75 volt voltage stabiliser tube. The prototypes for this stabiliser were the OA3 and the VR75-30.
The striking voltage is 100 but a supply of 105 volts is suggested to take into account tolerances. The minimum current is 5 mA and in the working range of 5 - 40 mA the voltage regulation is 5 Volts over this working range.
The base is International Octal but in this case only four pins are fitted 2, 3, 5 and 7.
In the glass tubular format the outer cylinder almost fills the diameter.
The mica disc prevents a view inside the cylinder.
The wide glass tube envelope is 29 mm in diameter and, excluding the IO base pins, is 77 mm tall.
References: Datasheet, 1040 & 3002. Type CV3798 was first introduced in 1943.

 

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

 

Absolute Maximum Operating Conditions
Stabiliser
Va
mAa
100
5-40
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated July 25, 2017.
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