I noticed that the left channel of my HD600s was making a slight buzz on some frequencies. If anyone has the Radiohead song "No Surprises", turn up your amp loud and listen to the intro. Is there an annoying buzz in either channel? For this song specifically I noticed the left channel to...

I noticed that when I have a EL2001 in my meta42 PS as opposed to a jumper over it, my +/- voltages are offset by about 0.2V. Without the EL2001, the voltages are offset by about 0.002V (1/10 as much, within the spec for TLE2426). What is the reason for this?

Here's my parts list...and...it comes to $78 for everything, which I think is really a lot for a cmoy amp. However, I should do this right the first time. So I'm willing to spend up to $100 to get the best sounding amp. Radioshack 276-147 Grid-Style PC Board-2200 Holes $3.99 Radioshack...