Microwave tube designers used to take numerous steps to reduce microphonism in klystrons.
2.
Where tuning was essential, a compromise usually was made between the resistance of the klystron to microphonism and the obtainable performance.
3.
The usual test for microphonism in electron tubes is to tap the tube with a finger, light mallet, or small rubber ball while working as amplifier or oscillator.
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