Description
Typical Constant Current Characteristics
| Technical specifications | |
|---|---|
| Filament | thoriated tungsten |
| Filament voltage | 5.8 V |
| Filament current | 130 A |
| Amplification factor | 45 |
| Inter-electrode Capacitance | |
| grid-cathode | 47pF |
| Grid to anode | 17pF |
| cathode-anode | 0.4pF |
| Maximum Ratings | |
|---|---|
| frequency | 120 MHz |
| Anode voltage | 12 kV |
| Grid voltage | -1500 V |
| Peak cathode current | 25 A |
| Anode dissipation | 10 KW |
| Grid dissipation | 350 W |
OUTLINE DIAGRAM
| Cooling | |
|---|---|
| Max. Air temperature at tube inlet | 45°C |
| Minimum Air flow cooling | 9.5 m³/min |
| Max. Air Outlet temp. | 119 °C |
| Max. Temp. at any point on the tube envelop | 240°C |
| Machanical | |
|---|---|
| Overall weight | 7.5 Kg |
| Overall diameter | 159 mm |
| Overall Length | 220 mm |
Mounting Instructions
The tube must always be connected vertically. The base of the tube can be either up or down at the preference of the equipment manufacturer. The tube filament should be protected from shock and vibration.
Cooling
The forced-air cooled tubes have radiator with finns that is fitted to the anode, through which the air is sucked. It is advisable that the air is drawn through the radiator fins, away from the filament and grid connections. The tubes can also be cooled with the air blown in through the base of the radiator and up past the filament connections. However this does suffer the disadvantage that hot air is blown onto the grid connection and into the equipment, which may cause overheating of other components. If the air is directed this way, it is recommended that the airflow be increased by approximately 20%.
The tube should be seated in an insulating duct and be protected from any vibration from the blower. This can be done by fitting a length of flexible ducting in the ducting to the tube. Please ensure appropriate air flow rate & pressure drop.
STANDBY OPERATION
Whenever filament power is applied a coolant must be circulated through the anode water jacket even though no anode or grid voltages are present. 60% – 80% of the filament power appears as heat in the anode. In the absence of coolant flow the temperatures will rise to levels which are harmful for the tube. If the coolant flow is obstructed the coolant jacket may rupture from generated steam pressure.
ABSOLUTE MAXIMUM RATINGS
Values shown for each type of service are based on the “absolute system” and are not to be exceeded under any service conditions. These ratings are limiting values outside which serviceability of the tube may be impaired. In order not to exceed absolute ratings the equipment designer has the responsibility of determining an average design value for each rating below the absolute value of that rating by a safety factor so that the absolute values will never be exceeded under any usual conditions of supply-voltage variation, load variation, or manufacturing variation in the equipment itself. It does not necessarily follow that combinations of absolute maximum ratings
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