I need help from fellow Stax-heads.
I'm having trouble with my Stax system since last week. For a reason that I don't know yet, the bass became boomy and loose and I get a lot of distortion if I turn the volume a little bit higher than my normal listening volume. Also, percussions are slightly harsher and I get some kind of metallic resonance on some hard-hitting notes. I can still listen to my music and it sounds pretty good at normal volumes, but not as good as what it used to.
Could it be the tubes approaching their end? They still glow and I get the same sound problems with both channels (L/R), so I'm not sure if they're the problem. I ordered a new pair of 6fq7 a couple of days ago just to verify, but I didn't receive them yet.
Could it be the OII themselves? I never heard of anyone with such problem, but I guess it could happen.
I played with the source and cable and this is definitely not where the problem lies. If it's the amp, I'm screwed because I don't know how to repair it and I doubt Stax still services this model.
Anyway, I know it's probably impossible to diagnose a problem just with the information I've given, but if you guys ever had a similar experience, feel free to share...