Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 77810
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Transmitting Triode, air cooled 
Identical to TYS5-2000

Base Wires
Was used by Transmittertube (Radio)
Filament Vf 14.5 Volts / If 26 Ampere / Direct

Silica envelope transmitting triode. Silca valves were introduced around 1920 by Mullard. Silica withstands high temperatures without softening as glass does. This feature made possible the construction of relatively compact power tubes with electrodes operating at high temperatures, so granting efficient radiation cooling.

Anodes were made by basket woven molybdenum ribbons. Filamentary cathodes were of tungsten or thoriated-tungsten for increased emission, as in this case.

  • 5.0 kV max anode voltage
  • 2 kW continuous plate dissipation, 2.5 kW intermittent
  • 2.0 A max emission
  • 20 Mhz full ratings, 30 MHz maximum operating frequency
Dimensions (WHD)
incl. pins / tip
x 477 x 115 mm / x 18.78 x 4.53 inch
Weight 1020 g / 35.98 oz
Information source - - Manufacturers Literature   
TYS5-2000: Private collection
Emilio Ciardiello


You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]