2X2 @ The Valve Museum

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2X2

Sensibly equivalent^¶ to:

2B21 2X2A 879 CV597 CV3748 VT-119

Extras ▼

National Union The Hampshire Collection Other 2X2 exhibits

The 2X2 is an EHT half wave rectifier. We also have the 2X2A variant in the museum.

The 2.5 volt heater indicates that it would be powered by a special heater winding of high insulation. Such a valve would have found application in oscilloscopes etc.

Within the anode bell can be seen the coated cathode tube. This has a small diameter in relation to the bell as the emission required is low but the gap needs to be large to avoid breakdown when a high Voltage is applied.

The classic envelope is 36 mm in diameter and, excluding the UX4 base pins, is 97 mm tall.

References: Data-sheet, ³⁰⁰² & ¹⁰⁴³. Type 2X2 was first introduced in 1939. See also 1939 adverts.

Pin Connections

UX4	1	2	3	4	tc
	h	nc	nc	h,k	a

Absolute Maximum Operating Conditions^¶

Rectifier	Vh	Ah	Va	mAa
	2.5	1.75	4,500	7.5

Thanks to Frank Philipse for supplying the above PDF datasheet.

Updated January 03, 2022.

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