Sounds like you may have a item leaking dc which is causing the 33H's transformers to sing.
Try walking through the 'Humbusters' section in PS Audio's interactive toolbox. The link is on the right.
PS Audio Toolbox
It should help you track down the offending component.
Good Luck,
John
Try walking through the 'Humbusters' section in PS Audio's interactive toolbox. The link is on the right.
PS Audio Toolbox
It should help you track down the offending component.
Good Luck,
John