Toshiba 2M248 series is a fixed frequency continuous wave magnetron intended for use in microwave cooking appliances. The average output power is 1030 watts to a matched load at 330 mA anode current in the frequency range from 2450 to 2470 MHz. The tube is a packaged magnet type and requires forced air cooling. The output is fed either into a rectangular waveguide or into an oven cavity directly.
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Toshiba 2M248 technical specifications.
| Frequency (matched load) | 2460 ± 10MHz |
| Filament Voltage (Nominal) | 3.15V |
| Filament Current | 10.0A |
| Cold Filament Resistance | 0.03ohms |
| Anode Potential | to be ground |
| Filament Potential | Negative high voltage |
| Physical Dimensions | See outline drawing |
| Terminal Connection | See outline drawing |
| Mounting Position | Any |
| Output Coupling | See outline drawing |
| Magnetic Field | Ferrite magnet packaged |
| Cooling | Forced air (Side blow) |
| Weight (approx.) | 830g |
| Type of Cathode | Directly heated thoriated tungsten filament |
| Absolute Maximum Rating - Filament Voltage (Min) | 2.7V |
| Absolute Maximum Rating - Filament Voltage (Max) | 3.6V |
| Absolute Maximum Rating - Cathode Preheating Time | 0s |
| Absolute Maximum Rating - Peak Anode Voltage | 4.85kV |
| Absolute Maximum Rating - Average Anode Current | 380mAdc |
| Absolute Maximum Rating - Peak Anode Current | 1.5A |
| Absolute Maximum Rating - Anode Input Power | 1.8kW |
| Absolute Maximum Rating - Load VSWR | 4 |
| Absolute Maximum Rating - Anode Temperature | 300°C |
| Absolute Maximum Rating - Antenna Seal Temperature | 320°C |
| Absolute Maximum Rating - Case Temperature | 120°C |
| Absolute Maximum Rating - Storage Temperature (Min) | -30°C |
| Absolute Maximum Rating - Storage Temperature (Max) | 60°C |
| Typical Operation - Power Supply | Single phase full wave rectified without filter |
| Typical Operation - Frequency | 2460MHz |
| Typical Operation - Filament Voltage | 3.15V |
| Typical Operation - Peak Anode Voltage | 4.35kV |
| Typical Operation - Average Anode Current | 330mAdc |
| Typical Operation - Output Power | 1030W |
| Typical Operation - Cooling Air Flow | 800ℓ/min |
| Typical Operation - Pressure Drop (Approx.) | 70Pa |
| Filament Transformer Design Center | 3.15 ±0.1V |
| Maximum Anode Temperature (Normal Condition) | 250°C |
| Standard Ambient Temperature (during measurement) | 25°C |
| Regulatory | Complies with tighter regulations on spurious radiation and line conducted noise |
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