| 21. | Some amplifiers can cope with the variation better than others can.
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| 22. | The exponential horn was replaced by an amplifier and a loudspeaker.
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| 23. | This was intended for use by hi-fi amplifier manufacturers.
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| 24. | In this case, an external headphone amplifier may be beneficial.
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| 25. | This is generally called a low noise amplifier ( LNA ).
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| 26. | Modern instruments use electronic sensors, amplifiers, and recording devices.
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| 27. | Some earlier attempts include a one-transistor amplifier in 1966.
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| 28. | Both amplifier power and speaker sensitivity affect the maximum realizable loudness.
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| 29. | Rear view of a tube ( valve ) combo guitar amplifier.
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| 30. | Over the next two years they developed their first valve amplifier.
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