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为满足中学物理教学的需要,特设计了J2457型真空二极管.这种电子管系直热式氧化物阴极、自然冷却阳极、玻璃外壳的真空二极管.它有以下特点:灯丝、阳极明显可见,排列方式和课本中的示意图完全一致;阳极电压采用低压;和中学现有的通用仪器J1201型低压电源、J1202型学生电源和J0401型演示用大型电表等配套.
In order to meet the needs of physics teaching in middle school, J2457 vacuum diodes are specially designed. These tubes are direct thermal oxide cathodes, naturally cooled anodes, and glass-enclosed vacuum diodes. They have the following characteristics: filaments, anodes are clearly visible, arrangement Fully consistent with the schematic diagram in the textbook; anode voltage using low voltage; and secondary school existing general-purpose instrument J1201 low-voltage power supply, J1202 student power supply and J0401 large-scale demonstration meter and other supporting.