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The GI-7BT (GI-70BT) triode is used for continuouswave or pulsed operation with anode modulation, as an oscillator and an amplifier.
The triode is available in two variants differing in the type of cooling: the GI-7BT with a heat sink for forced air cooling and the GI-70BT with no heat sink for other systems of cooling.
Cathode: indirectly heated, oxide-coated.
Envelope: metal-ceramic with ring leads of cathode, heater and grid.
Cooling: forced air.
Height: at most 110.5 mm with heat sink, 97 mm with no heat sink.
Diameter: at most 65 mm with heat sink, 47 mm with no heat sink.
Mass: at most 330 g with heat sink, 170 g with no heat sink.
KP - cathode and heater; P - heater; C - grid; A - anode
|OPERATING ENVIRONMENTAL CONDITIONS|
|Multiple impacts with acceleration, m/s²||735|
|Ambient temperature, °C||-60 to +100|
|Relative humidity at up to +40 °C, %||98|
|Heater voltage, V||12.6|
|Heater current, A||1.8-2.05|
|Mutual conductance (at anode voltage 1.3 kV, grid voltage change 1 V, anode current 150 mA), mA/V||20-26|
|Penetration factor (at anode voltage 1.3 kV, anode voltage change 200 V, anode current 150mA), %||1.2-1.8|
|Operating point (negative grid voltage at anode voltage 1.3 kV, anode current 150 mA), V||12.5-7.5|
|Interelectrode capacitance, pF:|
|Warm up time, s, at most||90|
|in CW operation (at heater voltage 11.6V, anode voltage 1.05 kV, anode current 300 mA, wavelength 18.5 cm), W, at least||40|
|in pulsed operation (at heater voltage 12.6 V, peak anode voltage 9 kV, peak anode current 7.5 A, wavelength 10 cm), kW, at least||12|
|Output power over 650 h of service (at heater voltage 11.6V, anode voltage 1.05 kV, anode current 300 mA, wavelength 18.5 cm), W, at least||32|
|Limit Operating Values|
|Heater voltage, V||12-13.2|
|Anode voltage, kV:|
|instantaneous value in CW operation||5|
|DC voltage in continuous operation||2.5|
|DC voltage with cold cathode||3|
|Grid voltage, V:|
|pulsed operation||-900 to +600|
|CW operation, instantaneous value||-400 to +80|
|Cathode current, A:|
|DC component under conditions of class Â|
|instantaneous value under conditions of class Â without modulation||1.25|
Anode current (DC component in pulsed
|Cathode heating time, min.||1.5|
|Pulse duration, µs||10|
|anode end face||200|
|anode heat sink||160|
|outer ceramic parts||250|
|Resistance in grid circuit, kOm||10|
Averaged Anode-Grid Characteristic Curves in Pulsed
Averaged Characteristic Curves Showing Oscillator
Output Power versus Anode Voltage in ContinuousWave Generation: