I haven't seen anything here about how to adjust the balance trimmer on the Dirtbag. The only thing read was to set it at noon and move on.
Well, I found and old Mark Hammer post about using that adjustment to tune out clock noise. I was hearing some clock noise when biasing the chips so i tried it.
With nothing being fed into the input, I probed pin 3 of IC5 and could clearly hear the clock. Tweaking the balance trim eliminated it or at least reduced it to the point that I couldn't hear it. YMMV.
Like I said, I don't know if this is common knowledge and I just missed it, or if this is new, but here it is anyway.
Are you biasing unboxed? If so you'll experience some clock noise until it's in an enclosure.
Josh
I think I should have posted this in the general forum, not tech help. I'm not actually requesting help. Just reporting info I learned.