90C1 @ The Valve Museum

▼ Menu

Home Search Indexes Equivalents Articles Adverts & Boxes Timeline Collections Donate Contact

90C1

Sensibly equivalent^¶ to:

CV5173 QS1215

See also:

SQ Voltage reference tubes - Voltage Reference and Stabiliser Tubes Advert - Keeping Voltages Steady

Extras ▼

Mullard G8LSD Valve Collection Other 90C1 exhibits

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 thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 45 mm tall.

References: Data-sheet, Data & ¹⁰⁴⁰. Type 90C1 was first introduced in 1956. See also 1956 adverts.

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 19, 2023.

Return to Main Index