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R-72

 
    
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The R-72 is an EHT rectifier with a PIV rating of 20 kV under optimum conditions.
The bell anode connects to and is supported by the top cap.
The filament looks to be thoriated tungsten.
The powered filament.
Here the filament can be seen as a self supporting loop.
The wide glass tube envelope is 38 mm in diameter and, excluding the base pins, is 103 mm tall.
Reference: Data-sheet. Type R-72 was first introduced in 1943.

 

Pin Connections
UX4
1
2
3
4
tc
f
-
-
f
a

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
2.5
3.0
-
20.0
Thanks to Frank Philipse for supplying the above PDF datasheet.
Updated June 17, 2020.
shape:wide.glass.tube construction:pinch type:rectifier.hw age:1940.1950 base:ux4 heater:2.5v pins:4 pin:1.f pin:2.- pin:3.- pin:4.f pin:tc.a
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