FD-934S is high power ceramic-metal
dynatron with thoriated tungsten cathode and
water cooling anode. With a maximum anode
dissipation of 130kW, and a maximum working
frequency 10MHz, it is widely used as an
oscillator for industrial high frequency heating.
General characteristics
Electrical characteristi cs
Filament…………cathode thoriated tungsten
Filament voltage…………………………12V
Filament current…………………………420A
Transconductance……………………82mA/V
Amplification factor………………………30
Oscillatory power……………………200kW
Interelectrode capacitances::
Grid-cathode…………………………185pF
Anode-cathode………………………3.4pF
Anode-grid…………………………110pF
Mechanical characteristi cs
Operating position………Vertical, anode down
Height(max.)…………………………690mm
Diameter (max.)………………………250mm
Weight (max.)……………………………30kg
Transportation & Operating position:
…………Vertical, anode down
Coolin g
Cooling methods…combination of water & air
Anode water flow…………………≥220L/min
Total air flow of Mandri, radiator & ceramic
crust…………………………………≥450m3/h
Temperature on seal of glass and
metal.(max.)…200℃
Maximum ratings
Filament voltage…………………………12V
Start current of filament ……………630A
Anode voltage ………………………… 15kV
Anode DC current………………………22A
Anode dissipation power………………130kW
Grid dissipation power…………………5kW
Working frequency……………………10MHz

Typical operation
Working frequency……………………300kHz
Anode DC voltage………………………13kV
Grid DC voltage………………………-800V
Anode DC current………………………21A
Anode DC current………………………3.4A
Prompting power………………………5100W
Prompting voltage……………………1500V
Anode output power…………………200kW