AV 2A3M Datasheet


Direct Replacement:



The AV 2A3M  is a Mesh Version of the AV 2A3-C37.  Mesh  plates are not made of solid nickel, but are made of nickel wire ( picture: six times enlarged)  The AV 2A3M is electrically identical with normal 2A3 tubes. 

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

This  tube uses AVVT's 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
  • White Mesh Wire Plates
  • Only available in  C37 Shaped Glass
  • Anti-microphonic Suspension in Tube Top
  • This tube uses hard-metal filaments, which can never break. ( Note2)
  • Ceramic UX4 Socket with Gold Plated pins
C37 Version

AV 2A3M    Filament Ratings 
Filament Voltage 
2.5 Volt  (AC or DC)
Filament Current 
2.5 Ampere 

AV 2A3M     Maximum Conditions  See  Note 3
Plate Voltage 
Plate Current 
Plate Dissipation 
Power Output in Class A
5.5 Watt 

AV 2A3M    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 Resistor
100k Ohm
Operating Lifetime 
40.000 hours 

AV 2A3M    Mechanical Data 
170 x 60mm (Incl.Socket) 
120 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.  Mesh tubes may develop a fluorcescent blue glow om the Plate.   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

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