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| GU-104AM |
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POWER TRANSMITTING TETRODE GU-104АМ
The GU-104АМ is a ceramic/metal tetrode with plate dissipation of 250 kW intended for use as a RF power amplifier in AM broadcast service, RF linear SSB amplifier as well as for operation in key modes with width-pulse modulation.
General Characteristics
Electrical Filament voltage 240,5 V Filament current at 24 V 710 А Cathode - mesh, thoriated tungsten Interelectrode capacitances (grounded cathode): Input 1300 pF Output 140 pF Feedback 5,5 pF Frequency, max. 30 MHzMechanical Maximum dimensions:Height 680 mm Diameter 295 mm Maximum weight 45 kg Cooling: plate - water forced other elements of envelope - air firced Maximum envelope temperature 175о С Maximum ratings
DC plate voltage: with no modulation 15 kV with modulation 14,5 kV DC screen voltage: with no modulation 1,7 kV with modulation 1 kV Plate dissipation 250 kW Screen dissipation 8 kW Grid dissipation 1 kW
RF power amplifier plate-screen modulated (class C)Frequency 30 2 MHz grounded grid grounded cathode Filament voltage 24 24 V DC plate voltage 14 14 kV DC screen voltage 0,8 0,8 kV DC grid voltage, negative 510 660 V DC plate current 22,3 27 А DC screen current 1,3 1,4 А DC grid current 0,53 1,3 А Output power 250 300 kW
Notes: 1. Plate modulation factor: ≤ 1, screen modulation factor: ≤ 0,7 2. In mode with plate-screen modulation plate dissipation can be increased up to 300 kW.
Linear power SSB amplifier at frequency 30 МHz (class АВ1)
1 tone 2 tones
Filament voltage 24 24 V DC plate voltage 14 14 kV DC screen voltage 1,4 1,4 kV DC quiescent current 14 14 А DC plate current 31 21.5 А DC screen current 3 1 А DC grid current ≤5 ≤1 mА Output power 250 250 kW in peak of envelope Intermodulation distortion of 3-rd and 5-th orders minus 35 dB
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