"John"wrote:
Hi, I bought an ATS 909 back in February and am generally pleased with
it except for the fact that the volume pot developed a slight
scratchiness in the lower range which is more noticeable using
headphones (of course) but still there when I change the volume while
listening to it without them.

Squirt some tuner cleaner (or even WD-40) into the volume control pot and
twist it back and forth several times.

Art N2AH