My Marantz 2220 headphone out seems to be gettng a louder background noise. Its never had a black background like a modern headphone amp. But the white noise that is there, Becomes more noticable as time goes on.
Is this to be expected? Anything practical I can do to reduce the noise? I did inspect the capacitors and they all look fine to the eye.
I have a Sherwood S-7200 with this problem - in my case some transistors are on the way out and have become noisy. Could be the case with yours also.