AlesaVaicVacuumTechnology
AV8B Datasheet
- LAST PRODUCTION WAS IN 2001 -
No Replacement
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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
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AV 8B SL, white nickel plates
Clicke here for Plate Curves
Osram-PX4
Mother of all AVVT white plate tubes
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Filament Ratings
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Filament Voltage |
5 Volt (AC or DC)
AC only as loudspeaker End-Stage
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Filament Current |
1.3 Ampere
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Maximum Conditions See Note 3
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Plate Voltage |
400Volt
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Plate Current |
60mA
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Plate Dissipation |
11Watt
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Power Output in Class A |
3,6Watt
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Typical Data
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Plate Voltage |
350V
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Plate Dissipation |
11 Watt
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Plate Current |
31mA
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Grid Voltage |
-37Volt
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Plate Impedance |
1500 Ohm
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Amplification Factor |
8
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Transconductance |
5,5 mA/V
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Load Impedance |
4000 - 8000 Ohms
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Grid Resistor |
100k Ohm
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Operating Lifetime |
40.000 hours
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Mechanical Data
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Size |
170 x 60mm (Incl.Socket)
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Weight |
130 Gram
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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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JAC-MUSIC ©2001. All Rights Reserved.
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