Imbali yophuhliso lwetekhnoloji yesandi inokwahlulwahlulwa ibe ngamanqanaba amane: ityhubhu, i-transistor, isekethe edibeneyo kunye ne-transistor yesiphumo sentsimi.

Ngo-1906, i-American de Forrest yasungula i-vacuum transistor, eyaqala ubuchwepheshe be-electro-acoustic yabantu. I-Bell Labs yasungulwa ngo-1927. Emva kobuchwepheshe be-negative feedback, uphuhliso lwetekhnoloji yeaudio lungene kwixesha elitsha, njengokuba i-Williamson amplifier isebenzise ngempumelelo itekhnoloji ye-negative feedback ukunciphisa kakhulu ukugqwetheka kwe-amplifier ukuya kwiminyaka yoo-1950, uphuhliso lwe-tube amplifier lufikelele kwelinye lawona maxesha anomdla kakhulu, iintlobo ngeentlobo zee-tube amplifier zivela ngokungenasiphelo. Ngenxa yokuba umbala wesandi se-tube amplifier umnandi kwaye ungqukuva, usathandwa ngabantu abathandayo.

Kwiminyaka yoo-1960, ukuvela kwee-transistors kwenza inani elikhulu labathandi besandi bangena kwihlabathi elibanzi lesandi. Ii-amplifiers ze-transistor zineempawu zesandi esithambileyo nesishukumayo, ukuphambuka okuphantsi, impendulo ebanzi yamaza kunye nobubanzi obuguqukayo.

Ekuqaleni kweminyaka yoo-1960, i-United States yaqala ukwazisa iisekethe ezidityanisiweyo, ezingamalungu amatsha etekhnoloji yeaudio. Ekuqaleni kweminyaka yoo-1970, iisekethe ezidityanisiweyo zaqatshelwa kancinci kancinci lishishini lesandi ngenxa yomgangatho wazo ophezulu, ixabiso eliphantsi, umthamo omncinci, imisebenzi emininzi njalo njalo. Ukuza kuthi ga ngoku, iisekethe ezidityanisiweyo zeaudio yefilimu exineneyo kunye neesekethe ezidityanisiweyo ze-amplifier ezisebenzayo ziye zasetyenziswa kakhulu kwiisekethe zeaudio.

Phakathi kwiminyaka yoo-1970, iJapan yavelisa ityhubhu yokuqala yokucebisa umsebenzi we-field effect. Ngenxa yokuba ityhubhu yamandla e-field effect ineempawu zetyhubhu ye-electron ecocekileyo, umbala otyebileyo nomnandi, kunye nobubanzi obuguqukayo be-90 dB, i-THD < 0.01% (100KHZ), kungekudala yaduma kwi-audio. Kwii-amplifier ezininzi namhlanje, ii-transistors ze-field effect zisetyenziswa njengemveliso yokugqibela.

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