{Collins} 75S-1 help

I am a new Collins collector/user and just acquired a 75S-1 receiver.

There is audio from the headphone jack on the front but I can't get any audio
from the speaker jack on the back.  Can anyone suggest a possible cause?

Also, the main dial is badly misaligned, making accurate tuning impossible. 
Where might I find information about fixing these type problems?

Thanks in advance.


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