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Sure- when the preamp is warming up, regardless of whether there is a load or not.
Occasionally, one of mine stays on all the time. At that point, I put 6SN7s in until is doesn't light up. What is wrong, if anything?
Be-Bop and Mahler
If the DC Offset led stays on, it usually means a 6SN7 that has sections that are far enough out of match that the servo cannot correct it. So replacement is what you do.
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