Disadvantages of Junction Field Effect Transistors (JFETs)
- It has high drain resistance
- Moderate input impedance
- It is slower in operation
Properties of a cathode used in thermionic valves.
It should have a low work function. A low work function helps to emit electrons from the cathode surface in a comparatively lower temperature It should have a high melting point. The temperature required to emit an electron from the cathode surface is quite high compared to the melting point of normal metals. A lower melting point causes vaporization of metals before they emit electrons. It should have high mechanical strength.
good post
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