@ee3: That is what I suspect. I'll check a few more things along with a new set of 6h30 tubes. If that does not do it, I'll send it to ARC for a complete checkup. What amp are you pairing it with and how sensitive is your speakers?
My Focal 1027 Be are 91db.
@tzh21y: The LS25 MKIK does not really use tubes for gain. It is used for cathode following circuit. So, I don't think new tubes will have much effect although you never know. It's interesting in that some people will say their tube preamp is dead quiet and some will say it is much noisier than solid state. I might go passive preamp or solid sate but I'll give LS25 mkII a chance first.
My Focal 1027 Be are 91db.
@tzh21y: The LS25 MKIK does not really use tubes for gain. It is used for cathode following circuit. So, I don't think new tubes will have much effect although you never know. It's interesting in that some people will say their tube preamp is dead quiet and some will say it is much noisier than solid state. I might go passive preamp or solid sate but I'll give LS25 mkII a chance first.