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8T25RA

Electron Tube triode 8T25RA,Toshiba Vacuum tube 8T25RA for High Frequency Machine

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Electron Tube triode 8T25RA,Toshiba Vacuum tube 8T25RA for High Frequency Machine

Filament voltage …………………………………… 8 + / - 0.5 V


Filament current …………………………………… 110A


Maximum impulse current of filament ………………………… 240A


Transconductance (Ia=2A)……………………………… 24mA/V


Magnification factor …………………………………… 20


Interelectrode capacitance


Grid-anode …………………………… 32pF


Grid - cathode …………………………… 46pF


Anode - cathode …………………………… 1.8 pF


Maximum operating frequency ……………………………… 40MHz


Maximum height …………………………………… 386mm


Max diameter …………………………………… 204mm


Weight (approx.) ………………………………… 18kg


Installation method …………………………………… Vertical, anode down


Cooling method …………………………………… Forced air cooling


Minimum air volume …………………………………… 25m³/min


Minimum static pressure …………………………………… 980Pa


Maximum inlet air temperature ……………………………… 40 ℃


The maximum working temperature of the radiator ……………………… 250 ℃


Maximum temperature of shell and seal …………………… 250 ℃


Limit operating condition


Rf power amplification and oscillation


(Type C telegram status)




Anode DC voltage ……………………………… 14KV


Grid DC voltage ……………………………… -2000V


Anode DC current ……………………………… 4.5 A


Grid DC current ……………………………… 0.8 A


Anode power dissipation ……………………………… 15KW


Grid power dissipation ……………………………… 400W




Typical operating condition (oscillation)


Anode DC voltage 10 12 KV


Anode DC current 4 3.7 A


Grid DC current 0.4 0.4 A


Grid impedance 2.5, 8ω


Anode output power 28 31 KW

      
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