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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. Our other examples of this rectifier Type have balloon envelopes and different anode shapes. See 43IU.
The two perforated anodes have a wide face and small front to back dimension.
One anode face view. The indirectly heated cathode sits in a cylindrical cavity at the centre of the anode. With the balloon style envelope versions the rectifiers are directly heated with coated ribbon filaments.
The top mica, the hairpin heater can be seen and the two cathodes are both connected to the central support.
A closer view of the construction.
The classic envelope is 45 mm in diameter, and excluding the B4 base pins is 104 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
2.5
350
120
Updated November 20, 2016.
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