AV 2A3 SL  Datasheet


Direct Replacement:



The AV 2A3 SL is a direct replacement for the RCA 2A3 monoplate tube.  The plate can do 28Watt, but to get this, you need to modify the amplifier.  Without modifications, you just plug in this tube into any normal 2A3 amplifier, and  tube and amplifuer will  work at the normal  2A3 operating point. 

All AVVT Tubes have a warranty period of 5 years, when ordered via official distributers. 

Thsi tube uses AVVTs unique Open Filament structure, resulting in high linearity, even at the maximum  output voltage. (Note1


  • AVVT's parallel ribbon filaments with 16 flat Surfaces (Pat Nr. PUV242-06, by Alesa Vaic). 
  • Two large getters
  • Carbon powdered plates
  • Unbreakable Hard-Glass Bulb, or thin C37 Shaped Glass
  • Anti-microphonic Suspension in Tube Top
  • Hard-metal filaments, which can never break. ( Note2)
  • Ceramic UX4 Socket with Gold Plated pins

 AV 2A3 SL, carbon powdered plates
Click here to enlarge Picture

2A3 Plate Curves

AV 2A3 SL Filament Ratings 
Filament Voltage 
2.5 Volt  (AC or DC)
Filament Current 
2.5 Ampere 
AV 2A3 SL Maximum Conditions     See  Note 3
Plate Voltage 
Plate Current 
Plate Dissipation 
Power Output in Class A
AV 2A3 SL Typical Data
Plate Voltage 
Plate Dissipation 
12,5 Watt 
Plate Current 
Grid Voltage 
Plate Impedance 
800 Ohm 
Amplification Factor 
5,2 mA/V 
Load Impedance
2400...5500 Ohms
Grid Resisor
100k Ohm
Operating Lifetime 
40.000 hours 
AV 2A3 SL Mechanical Data 
170 x 60mm (Incl.Socket) 
Weight (C37 Version) 
130 Gram 

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Note 1) Open Filaments means, the filaments and the grid are longer than the Plate, and stick out on both ends for about 5...8mm. The not fully warm ends of the filaments do not have a very good function, and cause distortion. This tube doesn't use this part of the filaments. Emitted electrons from the "cold"  ends, will bypass the Plate, and land on the glass. At maximum Power this may cause fluorescent, blue glow on the tube glass inside. See also our Tech Brief on Blue Glow in Tubes. 
Note 2) Hard-metal filaments are operated at much higher temperature than normal tubes. This tube will glow bright orange, instead of the dark orange color of nickel filament tubes. 
Note 3) Individual Test data, such as: Matching Data, Grid Current, Vacuum, Filament Current, etc, are on the Certificate that comes with each individual Tube. Each tube  is numbered, inside the glass with a metal Tag

Tube pictures with courtesy of VT-Components
Tube curves  with courtesy of AMR

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