Question

What are the disadvantages of Vacuum Tubes ?​

Answer 1

disadvantages of vacuum tubes are :

• Bulky, hence less suitable for portable products.
• Higher operating voltages generally required.
• High power consumption; needs heater supply that generates waste heat and yields lower efficiency, notably for small-signal circuits.
• Glass tubes are fragile, compared to metal transistors.

Answer 2

Explanation:

Vacuum Tubes: Disadvantages

1. Bulky, hence less suitable for portable products.
2. Higher operating voltages generally required.
3. High power consumption; needs heater supply that generates waste heat and yields lower efficiency, notably for small-signal circuits.
4. Glass tubes are fragile, compared to metal transistors.
5. Sometimes more prone to microphonics than transistors, depending upon circuit and device.
6. Cathode electron-emitting materials are used up in operation.
7. High-impedance devices that need impedance matching transformer for low-impedance loads, like speakers; however, the magnetic cushion provided by an output transformer prevents the output tubes from blowing up.
8. Sometimes higher cost than equivalently powered transistors.

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