佐久間駿 真空管アンプ 失われた音を求めて susumu sakuma
Direct Heating
DH is an association for audiophiles in seach of musical sound through hand made vacuum tube amplifiers.
www10.big.or.jp
BOOK
https://mjnetshop.thebase.in/items/35965050
mjnetshop.thebase.in
佐久間駿 コンコルド 真空管アンプ
テクノロジー
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