症状は「ボケた様な音になってきた」「たまに「バリッ」と音がする」
見るからに出力管(KT-88)の寿命がきています。
真空管ソケットも錆びているので交換。
入出力端子、スイッチ、電源コードも古くなっているので交換します。
カップリングのフィルムコンデンサ(BLACK CAT)も容量がむちゃくちゃなので交換します。
ソリッド抵抗が使われているので、もしや?と測ってみたら、抵抗値がむちゃくちゃでした。

92年?に電解コンデンサを知人に交換してもらったらしいですが・・・空中配線が危険(>_<)
パワー管は固定バイアス方式になっているので、自己バイアス方式に変更します。

結局、ほとんどの部品を交換する事になりました。
出力管KT-88と整流管EZ34はJJ製、電圧増幅+位相反転管6AN8は東芝製に交換。
電解コンデンサはJJ製、フィルムコンデンサはSOLEN(フランス)製。
しっかりとした、透明感のある音になりました。


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