AD100 Datasheet


No Replacement



The AD100 is more than just a High Power Version of the legendary AD1. It features AVVT's ribbon filaments with 16 flat Surfaces, and also the unique Open Filament structure. This patented structure from our pre-amplifier tubes (AV5, and AV8) has been succesfully adapted into this large power tube (Note1). This is a premium tube, with extreme linearity, exceeding the 300B


  • AVVT's patented ribbon filaments with 16 flat Surfaces, for more linearity 
  • Extra large getters 
  • Unbreakable Hard-Glass Bulb 
  • Anti-microphonic Suspension in Tube Top 
  • This tube use unbreakable hard-metal filaments. (Note2
  • Ceramic UX4 Socket with Gold Plated pins 

Click here to enlarge Picture
Detailed Image - Night View
Clicke here for Plate Curves

Recommended Driver Tubes   See  Note 4
Choke loaded
AV8,   AV8M
Choke loaded or resistor loaded
AD100 Filament Ratings
Filament Voltage 
4 Volt  (AC or DC 
Filament Current 
2.2 Ampere 
AD100 Maximum Conditions See  Note 3
Plate Voltage 
Plate Current 
Plate Dissipation 
Power Output in Class A 
AD100 Typical Data
Plate Voltage 
Plate Dissipation 
32 Watt 
Plate Current 
Grid Voltage 
Plate Impedance 
585 Ohm 
Amplification Factor 
6.5 mA/V 
Load Impedance 
1500 - 3500Ohm 
Grid Resistor
Operating Lifetime 
40.000 hours 
AD100 Mechanical Data 
Tube Size including Socket:
Size 180 x 65mm 
150 Gram 
For further information about our products, please visit

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 cold ends of the filaments do not have a very good function, and cause distortion. The AD100 does not use this part of the tube, and the emitted electrons by 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, are on the Certificate that comes with each individual Tube. Each tube is numbered, inside the bulb with a metal Tag

Note4)  Driver tubes.  It pays off to drive the AD100 with a tube like AD1, or AV8, because these tubes have the same harmonic distortion spectrum.   When the driver tube is operated in the same way as the AD100, the 2nd harmonics will be partially cancelled between the  two tubes. You will find more about this in circuit design books.  (for instance: R. zur Linde: "Verstärker in Röhrentechnik".  ISBN Nr: 3-928051-02-4)

Tube pictures with courtesy of VT-Components

JAC-MUSIC  ©2001. All Rights Reserved.