[Roadsters] Testing the AM radio

[Ritchie Labate]

I just want to make sure I've connected everything correctly with a newly acquired, original Toshiba AM radio for my '68 2000.

Connected the blue wire from harness to blue wire from radio (has inline 2a fuse).
Attached a black wire to the back of radio by screw as a ground.
Connected the 2 white speaker wires to one external speaker to test.

A backlight came on when I powered on but no sound as I adjusted the dial.
Any other suggestions? Are these Toshibas repairable if I took them to a shop?

Thank you for any feedback,

Ritch