How to remove hum

Mac OS X 10.9.5
I’m capturing music from an old 8-track tape using an ION turntable connected to my cassette deck.
The sound is so soft I’ve had to Amplify it and add EQ for sound quality. That had also amplified
a Hum throughout the recording. How can I isolate that hum and remove or at least minimize it?

It would be best to sort out the recording chain so that your computer receives an adequately loud signal. But if that’s not possible, use Effect > Notch Filter.

There’s advice on that page for removing hum.

– Bill