electron tube 7T85RB vacuum capacitor or triode is metal ceramic triode, using the thorium-tungsten cathode and air cooling anode. Maximum anode dissipation power can reach up to 2500W Intermittent use, the highest operating frequency 110MHz. This tube is applicable for industrial high-frequency equipment as oscillator and can be used interchangeably with type 7T85RB produced by TOSHIBA

Electron tube 7T85RB is a forced air cooled, ceramicmetal triode containing a thoriated tungsten carbide cathode intended for use in industrial high frequency heating service as an oscillator.
GENERAL  CHARACTERISTICS
Filament Voltage   6.3  V
Filament Current    35  A
Transconductance (Ia=0.35A)   5  mA/V
Amplification Factor  21
Interelectrode Capacitance
Grid Plate 13  pF
Grid Cathode 15 pF  
Plate Cathode     0.5 pF
Maximum Operating Frequency  110MHz
Maximum Height 215 mm
Maximum Diameter  130 mm
Appro. Weight  1.5 kg
Operation Position  Vertical
Cooling      Forced Air
Minimum Air Flow  3.3 m3/min
Minimum Static Pressure  166 Pa
Maximum In-coming Air Temprature 45
Maximum Anode Core and Seal Temprature  
250
MAXIMUM RATING ABSOLUTE #118alue
RF Power Amplifier and Oscillator
- Class C Telegraphy
                                                  
DC Plate Voltage  8                   8.5  kV
DC Plate Current  1                   1.2  kV
DC Grid Current  0.3                 0.35  A
Plate Dissipation  2.5                2.5  kW
Grid Dissipation   130               150 W

TYPICAL OPERATION(Oscillation #118alue)
                                                  
DC Plate Voltage  7.5           8   kV
DC Plate Current 0.9             1   A
Plate Output Power   5.1             6   kW
DC Grid Current  200          250  mA
Grid Impedance     4.5           4.5  k

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