I successfully built my Amp5 and I've been using it for a day now. It sounds absolutely *excellent*. I'm very happy.
One thing though, every once in a while my relay starts fluttering when the amp is unmuted. Normally right after I apply power for the first time. It clicks on and off perhaps 10-20 times a second.. then stays on or off for a few seconds, and does it again.
After a few minutes of powerup, it's fine. Locks in and works beautifully.
The circuit is not currently grounded; it's just sitting on a plastic container while I wait for my chassis to arrive.
Is this likely to be the culprit? I grounded it with a clip cord, and it hasn't happened since... but it only happened 2 or 3 times.
Is there something else I should check?