Otter,
You may be mistaking "outputs" and "inputs."
If the unit is like the one in Lee's video, you can see on the lower left there are buttons for "speaker A and B."
The "Rec Out" knob means nothing in your situation. If you can turn the "input" knob to "Tuner" you should expect to hear radio or at least some static through the speakers.
If you turn the knob to FM, for example, and hear noise out of the speakers, then the problem is in the turntable hookup.
If you turn the knob to FM and hear nothing through the speakers, but hear noise or radio through some headphones, then the problem is in the speaker connection (or the power amp part of the receiver.)
If you turn the knob to FM and hear nothing through the speakers AND nothing through the headphones, then it's in the preamp section of the receiver and you should (probably) start looking for a replacement.
