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2X2

Sensibly equivalent to:
2B21 2X2A 879 CV597 CV3748 VT-119
    
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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: Datasheet, 3002 & 1043. Type 2X2 was first introduced in 1939.

 

Pin Connections
UX4
1
2
3
4
tc
h
-
-
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 March 11, 2013.
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