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Which tuner to get and getting the most from it. Thank God, for the radio!

RE: Why hum? Why now?

I would also clean all your RCA interconnections - both at the cable ends, and on both the tuner and next stage. A hum is a very common sign of poor ground connections on one or both phono plug cables.

Also try reversing your AC plug in the power socket, if it can still go in both ways. The original power cords could, and usually one position had better audio performance (less hum).

I would also check the voltage from the selenium, again, if still in there. I can't imagine Foster Blair did not replace it. He usually does Maple Shade Scott tuner work. Not sure that is still true now that he's moved.

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