Electron tube 8F76R VHF tetrode
Output power 5.5kw

General characteristic:
Cathode thoriated tungsten
Heating direct
Filament voltage 7V
Filament current 64A
Interelectrode capacitances, approx.
Control grid-anode 0.5 pf
Cathode-control grid 48pf
Control grid-screen grid 56pf
Screen grid-anode 15pf
Transonductance (la=2A) 62ma/v
Internal amplification factor, average 8.5
Operating position vertical, anode up
Weight, approx. 4.5kg
Anode cooling (1) forced air
Air flow, min. 5000L/min
Pressure drop, min. 340pa
Cooling at the sealing between electrode terminal and ceramic forced air
Temperature on the surface of the tube, max. 250 c
Values for cooling given for maximum anode dissipation

Maximum ratings:
Frequency 250 MHz
Anode voltage 9 kv
Anode current 3A
Control-grid voltage -1 kv
Screen-grid voltage 1.5 kv
Anode dissipation 6 kw
Control-grid dissipation 70 w
Screen-grid dissipation 150 w

Typical operation:
Class ab RF power amplifier
Frequency 21 MHz
Output power 5.5 kw
Intermodulation distortion -44 dB
Anode voltage 5.5 kv
Control-grid bias voltage -82 v
Screen-grid voltage 800 v
Anode current (with signal) 1.3 a
Anode cureent (at zero signal) 0.6 a
Control-grid current 0 ma
Screen-grid current 6 ma