[[1] History of the Audio Amplifier, [Online]. https://sciencing.com/varactor-diode-5124911.html [Accessed on: 2019-11-26].]Search in Google Scholar
[[2] E83F Datasheet, [Online]. https://frank.pocnet.net/sheets/009/e/E83F.pdf [Accessed on: 2019-11-26].]Search in Google Scholar
[[3] М. Рашковский, Б. Пилипенко, В. Цирулников, Ф. Хмельницкий, Электричество в быту, Odessza, 1973]Search in Google Scholar
[[4] TBA 790 Datasheet, [Online]. https://www.radiomuseum.org/tubes/tube_tba790.html [Accessed on: 2019-11-26].]Search in Google Scholar
[[5] EF86 Datasheet, [Online]. https://frank.pocnet.net/sheets/010/e/EF86.pdf [Hozzáférés fátuma: 2019-11-26].]Search in Google Scholar
[[6] PCC88 Datasheet, [Online]. https://frank.pocnet.net/sheets/010/p/PCC88.pdf [Accessed on: 2019-11-26].]Search in Google Scholar
[[7] PL82 Datasheet, [Online]. https://frank.pocnet.net/sheets/030/p/PL82.pdf [Accessed on: 2019-11-26].]Search in Google Scholar
[[8] 85A2T Datasheet, [Online]. https://frank.pocnet.net/sheets/190/8/85A2.pdf [Accessed on: 2019-11-26].]Search in Google Scholar
[[9] Steve Bench: Tube Based Voltage Regulators. USA, 2000.]Search in Google Scholar
[[10] T. I. Erdei, Zs. Molnár, N. C. Obinna, G. Husi: Cyber physical systems in mechatronic research centre. MATEC Web Conf. Volume 126, 2017.10.1051/matecconf/201712601006]Search in Google Scholar
[[11] PL36 Datasheet, [Online]. https://frank.pocnet.net/sheets/010/p/PL36.pdf [Accessed on: 2019-11-26].]Search in Google Scholar
[[12] EZ80 Datasheet, [Online]. https://frank.pocnet.net/sheets/010/e/EZ80.pdf [Accessed on: 2019-11-26].]Search in Google Scholar
[[13] vituxCAD, [Online]. https://kimmosaunisto.net/Software/Software.html [Accessed on: 2019-11-26].]Search in Google Scholar