Hey, hows everyone doing? I'm new to the site! I've got a small problem with a EH Black Finger that I purchased from ebay yesterday. Firstly, there doesn't seem to be a great deal of a change in sound/compression when activated, only change in level and when the pre-gain is cranked up, a subtle overdrive. I decided to hook it up to my computer to see what it sounded like recorded, and it appears that there is only a level present on the left channel! Does anyone have any idea why it might be doing this? I tried opening it up, and everything looks fine inside. Could it be that the valves need replacing? Any feedback greatly appreciated!