AV 8B SL Datasheet. http://elektronenroehren.de/avvt

AlesaVaicVacuumTechnology

AV 8B SL / AV 8M SL datasheet

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 or white MESH 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 Click here to enlarge Picture	AV 8M SL, white mesh plates Click here to enlarge Picture

Clicke here for Measured Characteristics

Filament Ratings
Filament Voltage	5 Volt
Filament Current	1.3 Ampere

Maximum Conditions See Note 3
Plate Voltage	400Volt
Plate Current	100mA
Plate Dissipation	16Watt
Power Output in Class A	5Watt

Typical Data
Plate Voltage	350V
Plate Dissipation	14 Watt
Plate Current	40mA
Grid Voltage	-40Volt
Plate Impedance	1400 Ohm
Amplification Factor	6.5
Transconductance	4,6 mA/V
Load Impedance	3000 - 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 about our products, please visit the AVVT Homepage at:
http://elektronenroehren.de/avvt

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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