No one? No Quad owners out there?
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Thanks Digsmithd. Mine doesn't seem to change with time of day. It's one of the reasons I am concern about this being more than AC or DC or RF interference - I would expect those to fluctuate some.
I found an interesting thread on Audioasylum, someone found that the bolt holding the transformer in place on the case was loose, and tightening it in place solved the problem. Others seem to report some noise as well though, so I don't know if I should escalate this or not.
Any other experiences?
I think I figured it out. Does not fully compute in my relatively non-technical head, but here is what transpired: On the assumption that it might be a ground loop harmonic, and given that on occasion I did also hear a 60 Hz hum, I started playing with interconnects between the pre-amp and amp. My brother gave me his old HomeGrown Audio connects to try. These are grounded. Hook them up, and boom, terrible, loud buzzing, same as before, but way louder! Next I took them out and replaced with the AQ Sidewinder I was using with the tuner. No ground pin with these. Hooked them up, and the system is now dead quiet. I just realized in retrospect that all my interconnect play had been with grounded ones. Never tried this one pair that was just sitting there.
Does this make sense to anyone? Recall, the buzz was there even with the amp as a stand-alone, not connected to anything! Could the input binders be generating loops by themselves, and now putting ungrounded interconnects over them solves it? I do not get it, but I don't much care!! Happy to have everything nice and quiet once more!
Any Quad 909 owners with similar issues, take note.