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Basic function and structure of an electron tube - diode and triode. So many mistakes in such a short video ????????: The PY500A is of course designed for series heating and is a booster diode, not a HV rectifier The contacts on the tube: Socket Connections on the device: Socket Tubes shown: https://patric-sokoll.de/R%C3%B6hrenm... https://patric-sokoll.de/R%C3%B6hrenm... https://patric-sokoll.de/R%C3%B6hrenm...