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U21

Sensibly equivalent to:
CV3751 SU2150
    
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The Mazda U21 is a low currect EHT rectifier as used in CRT supplies.
The anode is held firmly in place by supports embedded in the glass rods moulded into the pinch.
The cathode is an oxide coated tube with the heater running inside. The cathode is connected to one side of the heater.
The most successful implementation of this EHT rectifier specification can be seen in the Cossor SU2150.
The classic envelope is 39 mm in diameter, and excluding the B4 base pins is 101 mm tall.
References: Datasheet & 1040. Type U21 was first introduced in 1937.

 

Pin Connections
B4
1
2
3
4
tc
-
-
f
f
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
2.0
1.85
4,500
5
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated October 23, 2015.
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