真空管アンプ製作

真空管アンプの自作記事です

製作資料

7241/7242

7421se

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7242 OTL
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13E1 OTL(7242を13E1に換装)

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真空管7241(7242と外観は同じ)

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7241規格

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7242 OTL 用PT

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7242規格

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