AlesaVaicVacuumTechnology

AV8B  Datasheet

- LAST PRODUCTION WAS IN 2001 -

No Replacement

 

 

These tubes are designed for driving Power Tubes that need a high input voltage on the grid, such as the 300B,  AD100,  and simular tubes. Other applications are:  Interstage Transformer driver, Phase Splitter driver.   Also it can be used a an Output Tube, producing maximum 5Watt Single Ended. 

It uses AVVTs unique Open Filament structure, resulting in extreme linearity, also at high output voltage. (Note1

Features

  • AVVT's parallel ribbon filaments with 16 flat Surfaces, for more linearity
  • Two large getters
  • White  nickel plates
  • 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 8B SL, white nickel plates
Clicke here for Plate Curves


Osram-PX4
Mother of all AVVT white plate tubes


 
 Filament Ratings 
Filament Voltage
5 Volt  (AC or DC)
AC only as loudspeaker End-Stage
Filament Current 
1.3 Ampere 
.
Maximum Conditions     See  Note 3
Plate Voltage 
400Volt 
Plate Current 
60mA 
Plate Dissipation 
 11Watt 
Power Output in Class A
3,6Watt 
.
Typical Data
Plate Voltage 
350V 
Plate Dissipation 
11 Watt 
Plate Current 
31mA 
Grid Voltage 
-37Volt 
Plate Impedance 
1500 Ohm 
Amplification Factor 
8
Transconductance 
5,5 mA/V 
Load Impedance
4000 - 8000 Ohms
Grid Resistor
100k Ohm
Operating Lifetime 
40.000 hours 
.
Mechanical Data 
Size 
170 x 60mm (Incl.Socket) 
Weight
130 Gram 

For further information  please visit: http://jacmusic.com

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


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