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43IU

Sensibly equivalent to:
1561 1821 1867 1867 441U 442BU 460BU 506BU A11B A11C A11D APV4 APV4 CV1039 CV3760 DW2 DW4-350 DW4-500 IW4-350 IW4-500 MU12 MU14 R1 R2 R3 R42 R4A U10 U12 U14 UU120/350 UU120/500 UU60/250
    
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This Cossor rectifier, 43-IU (43IU), is a full wave device with a directly heated oxide coated ribbon filament.
The construction is of two long anodes formed such that the connection to the support rod acts as an extra radiator.
The top of the envelope showing the shape of the anode pressing, the filament ribbons and their support springs.
This image clearly shows the ribbon filaments and the central support for the top mica. Without this support the spring tension would cause the mica to sag.
The balloon envelope is 54 mm in diameter, and excluding the B4 base pins is 110 mm tall.
References: 1040 & 1043. Type 43IU was first introduced in 1937.

 

Pin Connections
B4
1
2
3
4
a(2)
a(1)
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.0
350
120
Updated November 19, 2016.
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