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NU13A

Sensibly equivalent to:
4476A AU12 CV1266 RZ1-250 U15
    
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The NU13A is a later variant on the NU13 UK Navy rectifier and commercially would be the U15. The RZ1-250 has a higher maximum current rating.
The L4 base is 55 mm square.
The wide glass tube envelope is 48 mm in diameter and, excluding the L4 base pins, is 145 mm tall.
References: Datasheet & 1043. Type NU13A was first introduced in 1934.

 

Pin Connections
L4
1
2
3
4
a
f
f
-

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
6.0
2.0
1,500
200
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated April 29, 2013.
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