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R4

Sensibly equivalent to:
1561 CV1796 DW4/350 RV120/350 S11D U14 UU120/350
    
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The R4 from Ferranti is a full wave high vacuum rectifier. The maximum reservoir capacitor is 32 μF and the minimum series resistance is 120 Ω.
The twin rectifier sections supported only at the base.
The oval of anode is strengthened by the ribs pressed into it.
The central mica sheet holds the filament tension springs. The oxide coated filaments are made of thin ribbon.
The balloon envelope is 50 mm in diameter, and excluding the B4 base pins is 103 mm tall.
References: 1040 & 1043. Type R4 was first introduced in 1933.

 

Pin Connections
B4
1
2
3
4
a
a
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.5
350
120
Updated November 10, 2018.
shape:balloon construction:pinch type:rectifier.fw age:1930.1940 base:b4 heater:4.0v pins:4 pin:1.a pin:2.a pin:3.f pin:4.f
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