Imbali yophuhliso lweteknoloji yesandi inokwahlulwa ibe ngamanqanaba amane: ityhubhu, i-transistor, isiphaluka esidibeneyo kunye ne-transistor yempembelelo yentsimi.

Ngomnyaka we-1906, i-American de Forrest yenza i-vacuum transistor, eyaba nguvulindlela womntu we-electro-acoustic technology.I-Bell Labs yaqanjwa ngo-1927. Emva kobuchwephesha bengxelo engalunganga, uphuhliso lwetekhnoloji ye-audio ingene kwixesha elitsha, elifana ne-Williamson amplifier isebenzise ngempumelelo itekhnoloji yengxelo engalunganga ukunciphisa kakhulu ukugqwethwa kwe-amplifier ukuya kuma-1950s, uphuhliso lwe iamplifier ityhubhu ifikelele kwelinye lawona maxesha anomdla kakhulu, iintlobo ngeentlobo ze-tube amplifier zivela ngokungapheliyo.Ngenxa yokuba umbala wesandi we-tube amplifier uswiti kwaye ungqukuva, usathandwa ngabathandi.

Ngeminyaka yoo-1960, ukuvela kweetransistors kwenza ukuba inani elikhulu labathandi bomsindo bangene kwihlabathi elibanzi lomsindo.I-Transistor amplifiers ineempawu ze-timbre ethambileyo kunye neshukumayo, ukuphazamiseka okuphantsi, impendulo ebanzi kunye noluhlu oluguqukayo.

Ekuqaleni kweminyaka yee-1960, iUnited States yaqala yazisa iisekethe ezidibeneyo, ezingamalungu amatsha obuchwepheshe bomsindo.Ekuqaleni kwee-1970, iisekethe ezidibeneyo zaye zaqatshelwa ngokuthe ngcembe ngoshishino lwesandi ngenxa yomgangatho ophezulu, ixabiso eliphantsi, umthamo omncinci, imisebenzi emininzi kunye nokunye.Ukuza kuthi ga ngoku, iisekethe ezidityanisiweyo zomsindo wefilimu kunye neesekethe ezidibeneyo zeamplifier zisetyenziswe ngokubanzi kwiisekethe zeaudio.

Embindini we-1970s, iJapan yavelisa ityhubhu yengcebiso yomsebenzi wokuqala.Ngenxa yokuba ityhubhu yamandla enefuthe lentsimi ineempawu zetyhubhu ye-electron ecocekileyo, umbala otyebileyo kunye noswiti wethoni, kunye noluhlu oluguquguqukayo lwe-90 dB, THD <0.01% (100KHZ), ngokukhawuleza yaduma kwi-audio.Kwii-amplifiers ezininzi namhlanje, i-transistors yempembelelo yentsimi isetyenziswa njengemveliso yokugqibela.

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