AlesaVaicVacuumTechnology


PX4M Datasheet

- LAST PRODUCTION WAS IN 2001 -

Direct Replacement: NOS tubes only

 

The AVVT PX4 is only available with mesh plates.   This tube is an exact replacement for the Marconi PX4 

Features

  • AVVT's patented ribbon filaments with 8 flat Surfaces
  • Mesh plates
  • Ceramic + metal tube base. Nickel plated brass.  
  • ST or C37 Glass bulb 
  • Extra large getters, flashing the complete tube bottem. 
  • Unbreakable hard-metal filaments. (Note2

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Filament Ratings
Filament Voltage 
4 Volt  (AC or DC 
Filament Current 
1.1 Ampere 
Maximum Conditions See also Note 3
Plate Voltage 
450Volt
Plate Current 
60mA 
Plate Dissipation 
17Watt 
Power Output in Class A 
5.2Watt 
Typical Data
Plate Voltage 
250Volt
Plate Dissipation 
12Watt 
Plate Current 
  48mA
Grid Voltage 
33Volts
Plate Impedance 
900 Ohms
Amplification Factor 
5.0
Transconductance 
5.5mA/V 
Load Impedance 
2500 - 3600Ohm 
Grid Resistor
max. 150k Ohm
Operating Lifetime 
40.000 hours 
Mechanical Data 
Size 190 x 60mm
(Includes tube base) 
Weight 
125 Gram 

 

For further information about our products, please visit http://www.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 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, 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 bulb with a metal Tag

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