00579naa#a2200181#i#450# EN\\bibl\52921 20240902191509.1 2587-9936 20201225b2020####ek#y0engy0150####ca RUS RU Invention of an electronic tube audio frequency amplifier Journal article Sevastopol Federal State Educational Institution of Higher Education Sevastopol State University 2020 22 с. Journal article local . 621.37-621.39(091) RUS Pestrikov Viktor M rusjbpc.ru