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43IU

Sensibly equivalent to:
1561 1821 1867 1867 441U 442BU 460BU 506BU A11B A11C A11D APV4 APV4 CV1039 CV3760 DW2 DW4-500 DW4/350 IW4-350 IW4-500 MU12 MU14 R1 R2 R3 R42 R4A U10 U12 U14 UU120/350 UU120/500 UU60/250
    
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The Cossor 43-IU (43IU), is an indirectly heated full wave device rectifier. 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.
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 August 12, 2019.
shape:classic construction:pinch type:rectifier.fw age:1930.1940 base:b4 heater:4.0v pins:4 pin:1.a(2) pin:2.a(1) pin:3.f pin:4.f
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