Desde 1926
h) Vamos ver as curvas características da válvula 6DJ8:
Escrevendo a Lei de Kirchoff das Tensões (LKT) no circuito (malha) formado pela fonte, a tensão placa catodo da válvula e a tensão de catodo Vk, temos:
Ou
Essa última expressão mostra com clareza a forma de uma equação do primeiro grau, cujo gráfico é uma reta com inclinação –1/Rk.
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