My 1979 Fender Deluxe Reverb is buzzing when I’m playing. I have tightened all the visible hardware and the nuts on the baffle (but not too tight). The buzzing is most apparent when playing a low g note but I can still hear it at most other frequencies. When I play the low g and lightly touch the cone, the buzz goes away mostly. If I touch any other part of the amp, the buzzing continues. I suspect the speaker itself (the stock Fender Special Design) is the problem. Is it okay/smart to remove the speaker from the baffle, plug it back into the output, and see if it still buzzes? Maybe it just needs to be re-coned Please advise. I don’t have much experience with amp maintenance.