BigWill,
it wouldn't be something else in your chain of electronics would it? I know my tv had a really high pitched whine that was pretty easily drowned out when pushing a bit of volume (it came and went). Come to think of it, I haven't noticed it for a while, could be it's gone away.

That would be the only thing I regret about buying a CRT, it is such a heavy beast that I would tend to ignore minor functional problems because it's such a pain in the a@@ to haul it in for servicing (not that there has been many problems).

"Chickens don't clap."