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アンプ Absolare SignatureのPDF ユーザーマニュアルをオンラインで閲覧またはダウンロードできます。Absolare Signature 10 ページ。

4.  Installing  the  Tubes  
There are two tubes in the Preamplifier. 12AU7 / ECC82 is the standard tube, but
you can also use E80CC in Signature and Altius versions.
12AU7 / ECC82 tubes have one missing pin acting as a correct positioning key.
Align missing pin with the missing hole in the tube socket while inserting.
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ABSOLARE Preamplifier User Manual 0.9