What are the advantages and disadvantages of semiconductor diode over vaccum tubes?

Advantages:

• Semiconductor diode doesn’t require warm up time for operation.
• Semiconductor diode is cheaper as compared to vacuum tubes.
• Semiconductor diode does not produce any current in the absence of applied voltage.
• It has very small interelectrode capacitances.
• This is very important in high frequency application.
• Small in size and lighter weight.
• Less power consumption.
• It operates at low voltage.
• In the wiring it can be easily incorporated.
• This cannot be done with vacuum tubes.
• It has a long life and is robust in construction.

Disadvantages:

• Semiconductor diode cannot withstand high reverse voltage.
• It has poor response.
• It has reverse saturation current.
• In high frequency rang Noise level is higher in semiconductor device.