AV 32B SL Datasheet

This tube is  an AV300B SL with extra cooling plates. It will operate like a normal 300B,  in any amplifier. The only difference is, this tube allows maximum 65Watt plate dissipation. 


  • 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 

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Download AVVT 32B curves as PTE file - What is that?

AV 32B SL Filament Ratings
Filament Voltage 
5 Volt
Filament Current 
1.3 Ampere 
AV 32B SL Maximum Conditions     (See also Note 3)
Plate Voltage 
Plate Current 
Plate Dissipation 
Power Output in Class A 
AV 32B SL Typical Data     (See also Note 4)
Plate Voltage 
Plate Dissipation 
Plate Current 
Grid Voltage 
Plate Impedance 
690 Ohm 
Amplification Factor 
6 mA/V 
Load Impedance 
1500 - 3500Ohm 
Grid resistor
50k Ohm
Operating Lifetime 
40.000 hours 
AV 32B SL Mechanical Data
170 x 65mm (Includes Socket) 
Weight Standard Version
190 Grams 

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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
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. 

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