AV 302B SL Datasheet


Near Replacement:



This tube is an AV300B SL with extra cooling plates, and larger filaments. It will operate like a normal 300B,  but needs more filament current.  This tube will give more impulse power in Class A,  or can be used in OTL applications. 


  • This tube uses AVVT's unique Super-Linear Patent (Note1) 
  • AVVT's patented ribbon filaments with 16 flat Surfaces, for more linearity 
  • Two extra large getters 
  • Unbreakable Hard-Glass. Bulb is larger sized than normal 300B. 
  • Anti-microphonic Suspension in Tube Top 
  • All 1999 (and later) AVVT tubes use unbreakable hard-metal filaments. (Note2
  • Ceramic UX4 Socket with Gold Plated pins 

AV 302B SL in C37 Version (Enlarge)

AV 302B SL Filament Ratings
Filament Voltage 
5 Volt (AC or DC) 
Filament Current 
2.2 Ampere 

AV 302B SL Maximum Conditions     (See also Note 3)
Plate Voltage 
Plate Current 
Plate Dissipation 
Power Output in Class A 

AV 302B SL Typical Data     (See also Note 4)
Plate Voltage 
Plate Dissipation 
50 Watt 
Plate Current 
Grid Voltage 
Plate Impedance 
530 Ohm 
Amplification Factor 
6.6 mA/V 
Load Impedance 
1500 - 3500Ohm 
Grid resistor
50k Ohm
Operating Lifetime 
40.000 hours 

AV 302B SL Mechanical Data
170 x 65mm (Includes Socket) 
Weight Standard Version
185 Grams 
Weight C37 Version
178 Grams

For further information about our products, please visit

Note 1)  Super Linear platesare based on an exclusive AVVT patent.  The cold ends of the filaments do not have a very good function, and cause distortion.  This tube has  four cavities inside the plate, that cover the cold ends of the filaments. These cavities are covered by four nickel plates, that you can see from the outside.  Within these cavities, plate current will not be able to flow,  and this disables the emission of the cold end of the filaments.
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 has  is numbered, inside the bulb  with a metal Tag
The AV 302B SL can  withstand the maximum power dissipation continiously.
Note 4 Typical Data are choosen higher as for the 300B.  When operated at lower power level, refer to typical data of the 300B for mu, transconductance, and Plate Resistance.  You can test this tube with normal  300B settings.  (Check if the tube tester will still give 5Volt filament voltage at 2.2 Amps).
Tube picture with courtesy of Dieter Ennemoser

JAC-MUSIC  ©2001. All Rights Reserved.