The AD1M is a beautifully constructed tube, and it is a Mesh Version of the AD1. This tube is fully compatible to the original Telefunken AD1, using original NOS sockets. This tube uses AVVT's unique Open Filament structure, resulting in high linearity, even at the maximum output signal (Note1) Features
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Plates |
Curves |
Socket |
Night view |
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Filament Voltage |
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Filament Current |
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Plate Voltage |
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Plate Current |
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Anode Dissipation |
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Power Output in Class A |
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Plate Voltage |
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Plate Dissipation |
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Plate 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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Tube Weight |
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Telefunken P5 Socket enlarge 5x |
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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. Mesh tubes
may develop a fluorcescent blue glow om the Plate. 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 |