Is the oldies station any good?
Seriously, you may need to change the arm cable. I have had a few problems with noise in my system. I always try changing cables before I run the the whole ground loop check. I found I need a cable that really rejects any intereference. My Rega RB250 is of the OL variety, and their cabling seems to be much better than stock.
I also have a RB300 that is rewired with silver wire, and while it is still better than a stock cable, it does pick up some noise. It is not shielded.
I don't know about tubes causing this problem, but that seems unlikely. Don't quote me on this, I'm no EE.
I know others here will help, so don't sell yet! It may be something easy.
Seriously, you may need to change the arm cable. I have had a few problems with noise in my system. I always try changing cables before I run the the whole ground loop check. I found I need a cable that really rejects any intereference. My Rega RB250 is of the OL variety, and their cabling seems to be much better than stock.
I also have a RB300 that is rewired with silver wire, and while it is still better than a stock cable, it does pick up some noise. It is not shielded.
I don't know about tubes causing this problem, but that seems unlikely. Don't quote me on this, I'm no EE.
I know others here will help, so don't sell yet! It may be something easy.