It is your tube. Small chance a capacitor but very small. I would call some brokers in the back of Stereophile for a replacement as Sonic Frontiers doesn't sell the nicer tubes.
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Hello, I too have the same problem with my SFL-1 and I believe that I need to replace the tube as well. What would you guys recommend as a warm tube to tame my occasionally bright system? I am using a mosfet ss amp and smallish Thiel loudspeakers. I am thinking that a Mullard tube would be best? But which one?