This is because a push pull amplifier has a symmetric ( class A amplifiers, which are otherwise required for single-ended linear amplification.
2.
In a tube amplifier, the transition from linear amplification to limiting is less abrupt than in a solid state unit, resulting in a less grating form of distortion at the onset of clipping.
3.
He soon realized that his " vacuum " Audion had markedly different characteristics from the De Forest version, and was really a quite different device, capable of linear amplification and at much higher frequencies.
4.
He pioneered the field of digital cellular communication in the 1980s through the use of high power linear amplification and low bit rate voice encoding technologies and received a patent in 1992 ( US patent # 5, 084, 869 ) for his work in the area of digital cellular base station design.
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