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我們發現在單端放大器中，從電源到地線有3個電阻，第一個R1就是負載本身，第二個R2則是主動元件的電流通道所產生的電阻，第三個R3則是製造偏壓用的電阻。電路學告訴我們，I x (R1+R2+R3)=V，所以當我們把較多的電流送進負載，也會造成負載電壓拉高，此時R2 x I占的電壓差一定會變小，這就代表了電流通道二端電壓差也跟著變小，所以負載線才會是斜斜的而不是垂直的。也就是因為如此，所以三極真空管的特性曲線比五極管更加適合做出高線性的放大器。
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《暗黑破壞神 III：奪魂之鐮》將於 3 月 25 日向全球各地的 Windows和Mac玩家發出聖戰的號召，一同對抗死亡的浪潮。各路英雄好漢若有意接受徵召，一同迎戰來勢洶洶的歿天使。
美國晶體音響設計大師Nelson Pass(Pass Lab的創辦人)，在談到真空管機音色可以如此豐富多變時，也曾提到被動元件的影響巨大。他認為輸出變壓器本身，就是造成了真空管機聲音如此多樣化的主因。
