Why is a negative feedback in the amplifier desirable
Negative feedback and vacuum tube life cycle
No, whether or not a vacuum tube is used on a negative feedback circuit does not directly affect the life of the tube. As long as the tube is not misused, it should be fine. It may be easier to design a circuit with feedback to make sure the tubes run within a few parameters, but this is just one more thing to consider when designing a circuit without feedback.
The main cause of tube failure, aside from direct physical damage, is cathode wear. The cathode has a special coating to reduce the work function. This allows for reasonable cathode currents at lower temperatures than usual. However, this coating degrades over time, especially as electrons leave the surface of the cathode. In very broad terms, any cathode coating is good for a certain number of total coulombs, although there are many more than that. Feeback or no feedback alone does not mean higher or lower average cathode current. Typically these tubes are biased at the recommended operating points, so both circuit types would likely have roughly the same average cathode current.
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