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ГУ-78Б
TETRODE The GU-78B tetrode is used for power amplification in distributed amplifiers and single-sideband signal amplifiers at frequencies up to 250 MHz, in RF industrial engineering equipment. GENERAL Cathode: indirectly heated, oxide-coated. Envelope: metal ceramic, with ring leads of cathode, grid 2 and anode and pin leads of grid 1. Cooling: forced air. Height: at most 120 mm. Diameter: at most 111 mm. Mass: at most 1.8kg. OPERATING ENVIRONMENTAL CONDITIONS Vibration loads: frequencies, Hz ............. 1-60 acceleration, m/s2 ............ 20 Multiple impacts with acceleration, m/s2 ........... 150 Ambient temperature, ° С .............. -60 to+70 Relative humidity at up to +25 ° Сwithout moisture condensation, % ............ 98 BASIC DATA Electrical Parameters Heater voltage (AC or DC), V ............... 27 Heater current, A ............... 3.4-4 Anode voltage, kV ........... 1.7 Grid 2 voltage, V ............ 300 Negative grid 1 bias voltage, V ............. 51-25 Negative cutoff voltage (at anode voltage 3 kV, anode current 20 mA), absolute value, V ........... -150 Anode current, A .......... 1.5 Anode current at zero grid 1 voltage (at anode voltage 250 V), mA, at most ............... 4.2 Grid 2 current at zero grid 1 voltage (at anode voltage 250 V), mA, at most ............ 0.9 Mutual conductance, mA/V ........... 40-80 Output power under amplification of class AB1, kW: at heater voltage 27 V, at least ............ 2.5 at heater voltage 25.7 V, at least ........... 2.2 Common-cathode interelectrode capacitance, pF: input ............ 100-150 output ............. 15-30 transfer, at most ............. 0.25 Limit Operating Values Heater voltage (AC or DC), V ............. 25.5-28.3 Anode voltage, V: DC .......... 3200 instantaneous value .............. 6200 Grid 2 voltage (DC), V ................ 350 Negative grid 1 voltage (DC, absolute value), V ............ 150 Cathode-heater voltage (either polarity, absolute value), V .............. 150 Cathode current (DC component), mA ........... 2200 Grid 1 current (DC component), mA ............ 25 Dissipation, W: anode ........... 2500 grid 2 ........... 30 grid 1 ............ 1 Operating frequency, MHz ........... 250 Cathode heating time, s .......... 240 Envelope temperature at hottest point, °C ........... 200
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