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RG1-240A

Sensibly equivalent to:
2V/301A AU6 CV1072 CV1626 ESU101 GU50 GU51 NU16 VU72
See also:
High Voltage Rectifiers Advert - CV1072 short entry - Audio Power Valves Advert
    
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The RG1-240A is a high voltage half wave rectifier. To deliver DC power to medium sized equipment, several would be operated together. Maybe six on a three phase supply.
Mercury vapour rectifiers of the GU1 class were introduced in the mid-1930s but, despite filling a real need, they became unpopular because they were troublesome in service. The RG1-240 was introduced in 1938 and the A variant some time later.
It took valve designers an amazingly long time to learn that the oxide-coated filament had to be shielded from the anode, that the anode-shield gap needed to be uniform and smoothly profiled, and that use of a thermal delay switch (e.g. DLS10) was essential. The RG1-240A is a later rectifier exemplifying these features. It was successful and widely used. Exhibit NU8 (equal to RG1-125) exemplifies an earlier, much less successful design which the Navy nevertheless went on using for years.
The maximum reservoir capacitor had to be limited to 5 µF.
The classic envelope is 44 mm in diameter and, excluding the B4 base pins, is 117 mm tall.
References: Datasheet, 1040 & 1043. Type RG1-240A was first introduced in 1938.

 

Pin Connections
B4
1
2
3
4
-
-
f
f

 

Absolute Maximum Operating Conditions
Rectifier
Vh
Ah
Va
mAa
4.0
2.7
2,220
250
PDF scanned from an original document held by the museum
Updated October 15, 2016.
shape:classic construction:pinch type:rectifier.hw age:1930.1940 base:b4 heater:4.0v pins:4 pin:1.- pin:2.- pin:3.f pin:4.f
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