The 6SN7 tube is an excellent choice. Many NOS tubes available so you can find which ones match your taste. In my SLP-98P I've found the coin-base Sylvania's to be as good as any. The RCA 'reds' are also a popular choice.
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Glenn...
Canton Reference 9 Clearaudio SM Pro Focal Bathys JLA 10" Dominion Kuzma Stabi S w/MC & MM Magnepan 1,7i McIntosh MA8950 & MR88 Oppo 203 Roon Nucleus Rose Hifi RS150B Shunyata Gemini-4 Sony ST-A6B, TA-F6B, ST-J75 & PS-X75 Sorane SA1.2 & TA-1L Stillpoints LP1v2 WW Pt, Au & Ag
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