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90C1

Sensibly equivalent to:
CV5173 QS1215
See also:
SQ Voltage reference tubes - Voltage Reference and Stabiliser Tubes Advert
    
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The Mullard 90C1 is a voltage regulator discharge tube. The tube will strike at 115 Volts and will regulate to 90 Volts for currents of between 1 and 40 mA.
The specifications show a regulation of 14 Volts for this range of currents. This would be a wide tolerance by any standard. It is probable that this was intended to supply something like an oscillator that required sensibly constant current.
Special quality versions were made and given the type designation M8206 on a B7G base and M8207 with flying leads.
The internal coating obscures most of the envelope but close-up the construction is of a half cylinder cathode with a central rod anode.
The thin glass tube envelope is 18 mm in diameter, and excluding the B7G base pins is 47 mm tall.
References: Datasheet & 1040. Type 90C1 was first introduced in 1956.

 

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

 

Absolute Maximum Operating Conditions
Stabiliser
Vh
Ah
Va
mAa
-
-
90-115
1-40
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated January 20, 2017.
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