These tubes are designed for driving Power Tubes that need a high input
voltage on the grid, such as the AV 520B-SLX, VT-4C, UV845
and simular tubes. Other applications are, Very Linear Output tube ( pre-amplifer,
Head-Phone Amplifier). 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 |
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Click here to enlarge Picture |
Click here to enlarge Picture |
Clicke here for Measured Characteristics
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Filament Voltage |
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Filament Current |
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Anode Voltage |
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Anode Current |
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Anode Dissipation |
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Power Output in Class A |
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Anode Voltage |
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Anode Dissipation |
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Anode Current |
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Grid Voltage |
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Plate Impedance |
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Amplification Factor |
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Transconductance |
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Load Impedance |
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Grid resistor |
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Operating Lifetime |
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Size |
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Weight |
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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 Anode, 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 anode, 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 |