Hiki ke hoʻokaʻawale ʻia ka mōʻaukala hoʻomohala o ka ʻenehana kani i ʻehā mau pae: tube, transistor, integrated circuit a me ka field effect transistor.

I ka makahiki 1906, ua hana ʻo American de Forrest i ka transistor vacuum, ka mea nāna i hoʻomaka i ka ʻenehana electro-acoustic kanaka. Ua hana ʻia ʻo Bell Labs i ka makahiki 1927. Ma hope o ka ʻenehana manaʻo maikaʻi ʻole, ua komo ka hoʻomohala ʻana o ka ʻenehana leo i kahi au hou, e like me ka hoʻohana pono ʻana o ka amplifier Williamson i ka ʻenehana manaʻo maikaʻi ʻole e hōʻemi nui i ka hoʻopilikia ʻana o ka amplifier i nā makahiki 1950, ua hōʻea ka hoʻomohala ʻana o ka amplifier tube i kekahi o nā wā hoihoi loa, puka mai nā ʻano amplifiers tube like ʻole. Ma muli o ke ʻano o ke kala leo o ka amplifier tube he ʻono a poepoe, makemake nui ʻia e ka poʻe hoihoi.

I nā makahiki 1960, ʻo ka puka ʻana mai o nā transistors i hoʻokomo i ka nui o nā mea hoihoi leo i kahi honua leo ākea. Loaʻa i nā mea hoʻonui transistor nā ʻano o ka leo palupalu a neʻe, ka distortion haʻahaʻa, ka pane alapine ākea a me ka laulā dynamic.

I ka hoʻomaka ʻana o nā makahiki 1960, ua hoʻolauna mua ʻo ʻAmelika Hui Pū ʻIa i nā kaapuni hoʻohui ʻia, he mau lālā hou ia o ka ʻenehana leo. I ka hoʻomaka ʻana o nā makahiki 1970, ua ʻike mālie ʻia nā kaapuni hoʻohui ʻia e ka ʻoihana leo ma muli o ko lākou kūlana kiʻekiʻe, ke kumukūʻai haʻahaʻa, ka nui liʻiliʻi, nā hana he nui a pēlā aku. A hiki i kēia manawa, ua hoʻohana nui ʻia nā kaapuni hoʻohui leo kiʻiʻoniʻoni mānoanoa a me nā kaapuni hoʻohui amplifier hana i nā kaapuni leo.

I ka waena o nā makahiki 1970, ua hana ʻo Iapana i ka ʻōmole ʻōlelo aʻoaʻo hana hopena kahua mua. No ka mea, he ʻano o ka ʻōmole mana hopena kahua nā ʻano o ka ʻōmole uila maʻemaʻe, ke kala leo mānoanoa a ʻono, a me ka laulā ikaika o 90 dB, THD < 0.01% (100KHZ), ua lilo koke ia i mea kaulana i ka leo. I loko o nā amplifiers he nui i kēia lā, hoʻohana ʻia nā transistors hopena kahua ma ke ʻano he hopena hope loa.

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