Mepụta nsụgharị dị mgbagwoju anya nke ahịrịokwu a Mmetụta nke nkwụsị nke ọkà okwu dị iche n'etiti amplifiers tube na amplifiers transistor.
N'ezie, nsụgharị dị mgbagwoju anya nke ahịrịokwu ahụ bụ "Mmetụta nke nkwụsị okwu dị iche n'etiti amplifiers tube na amplifiers transistor, nke bụ isi n'ihi na amplifiers tube na-ejikarị ndị na-agbanwe ihe na-emepụta ihe, ma enweghị ike iji nzaghachi na-adịghị mma n'ihi nsogbu nsogbu na sekit ndị na-agbanwe agbanwe. "