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This is a forced-air cooled tetrode designed for use as an amplifier in VHF-TV and FM transmitters. It has a high transconductance essential for high gain and very efficient operation, and assures long life and highly reliable operation. |
Technical specification
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Model: 7F71RA |
General Characteristics(for more details, please download or ask for) | ||||||||
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Frequency for Max. Rating |
250 MHz |
Transconductance(Ia=1.6A, Ug2=500V) |
70 mA/V |
Filament Voltage |
4 V +/-5% | ||||
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Anode Voltage(Max.) |
5 kV |
Internal Amp. Factor |
11 |
Filament Current |
78 A | ||||
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Anode Current(Max.) |
2.4 A |
Cathode |
Thoriated-Tungsten |
Length |
165 mm | ||||
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Control Grid Voltage(Max.) |
-500 V |
Heating |
Direct, DC or S/P AC |
Diameter |
130 mm | ||||
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Screen-Grid Voltage(Max.) |
1 kV |
Interelectrode Capacitance |
Weight |
2.7 kg | |||||
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Anode Dissipation(Max.) |
3.5 kW |
Cathode-Control Grid |
54 pF |
Anode Cooling |
Forced Air | ||||
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Control-Grid Dissipation(Max.) |
20 W |
Control Grid-Screen Grid |
95 pF |
Operation Position |
Vertical, Anode up or down | ||||
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Screen-Grid Dissipation(Max.) |
50 W |
Screen Grid-Anode |
14 pF | ||||||
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Typical Operation | |||||||||
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Type of Service |
F.(Hz) |
Peak-of-Sync Pout |
Bandwidth(-1dB) |
Gain |
Ua |
Ug1 |
Ug2 |
Ia (with signal) |
Ia (at zero signal) |
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Combined Amplification |
220M |
1.36 kW |
8 MHz |
15 dB |
2.5 kV |
-40 V |
500 V |
1.11 A |
0.5 A |
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Vision only |
220M |
2.72 kW |
6 MHz |
15 dB |
3.0 kV |
-40 V |
500 V |
1.6 A |
0.5 A |