COMPARISON OF SOME COMMON Full-Wave 4V RECTIFIER VALVES / TUBES  
Arranged by Base - Current - Voltage  
  Type Base Heater Volts Heater Current Direct Anode Volts Anode Current  
        A Indirect RMS mA mean  
                 
  DW2 B4 4.0 1.0 D 250 60  
  U143 B4 4.0 1.1 D 500 60  
  UU60/250 B4 4.0 1.3 D/I 300 75  
  DW4/350 B4 4.0 2.0 D 350 120  
  IW4/350 B4 4.0 2.0 D/I 350 120  
  R4 B4 4.0 2.5 D 350 120  
  RV120/350 B4 4.0 2.0 D 350 120  
  U12 B4 4.0 2.5 D 350 120  
  UU120/350A B4 4.0 2.5 D/I 350 120  
  APV4 B4 4.0 2.0 D/I 400 120  
  DW4/500 B4 4.0 2.0 D 500 120  
  IW4/500 B4 4.0 2.5 D/I 500 120  
  MU14 B4 4.0 2.5 D/I 500 120  
  R43 B4 4.0 2.5 D 500 120  
  R4A B4 4.0 2.5 D 500 120  
  RV120/500 B4 4.0 2.0 D 500 120  
  U14 B4 4.0 2.5 D 500 120  
  U18/20 B4 4.0 3.0 D 500 120  
  UU12 B4 4.0 2.5 D/I 500 120  
  UU120/500 B4 4.0 2.5 D/I 500 120  
  UU5 B4 4.0 2.3 D/I 500 120  
  FW4/800 B4 4.0 3.0 D 850 125  
  UU10 B4 4.0 2.3 D/I 500 180  
  RV200/600 B4 4.0 2.8 D 600 200  
  AX50 B4 4.0 3.8 D 500 250  
  FW4/500 B4 4.0 3.0 D 500 250  
  431IU B5 4.0 2.5 I 500 150  
  451IU B5 4.0 3.5 I 500 250  
  AZ41 B8A 4.0 0.7 D 300 70  
  AZ31 Int Oct 4.0 1.1 D 500 60  
  UU6 Maz Oct 4.0 1.4 D/I 350 120  
  UU7 Maz Oct 4.0 2.3 D/I 350 180  
  UU8 Maz Oct 4.0 2.8 D/I 350 250  
  AZ1 SC8 4.0 1.1 D 300 100  
                 
         
  NOTE  Care should be taken in interpreting these figures as the ratings are not directly comparable on 
  account of variations in the permitted capacitative loading and minimum series resistance requirements.  
  Full specifications should be taken into account when considering type interchange.    
     
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