Help with hookup

This might be a dumb question but I will ask anyway....
What are you using as an input source? CD player? Streamer? Phono? Make sure you have that input source selected and then do you see the needles on the c2300 moving as you turn up the volume ?
try multiple sources if nothing is working could be your main output tubes possibly 

Also try using output 1 or output 2 and select that output on the front of your c2300 

On the back panel of the MC352, there's a "INPUT MODE" selector, make sure it is at "BALANCED" position. 

https://img.aussieaudiomart.com/uploads/large/1807777-mcintosh-mc352-power-amp-excellent-condition.j...

Thanks! You have given me some things to try. The needles do move on both pieces when on. And I can hear through the headphones. 

As the meters on the mc352 are responding to the signal from the preamp, I suspect " it " is at the amp end. What are the speaker wire connections you are using, both at the amp end and the speaker end ? If you are using bare wire, make sure enough insulation has been removed from the cable ends to make contact, but not so much, that the positive and negative wires are touching ( I am sorry, I have seen this a few times in my lifetime ). This scenario will short the output ( no sound ). Was the equipment working properly, as far as you know, before you acquired the pieces ? Sorry for the questions......just part of trying to help.....