Welcome to the forum! Don't know exactly what year your unit is, but most of the guys on this forum would agree: don't plug in your old equipment until you've replaced all the paper and wax capacitors... bottom line. The buzz could originate from any number of issues, but old capacitors can pop without warning and cause some costly damage to your new find (as well as burn down your house). There's loads of resources on this site for getting familiar with electrical restoration, or you can start here http://antiqueradio.org/recap.htm
for the lowdown on where to start. Finding a schematic for your console (follow the link above) will give you and other forum members a better idea of what's going on inside your unit and how to fix it.
This is a great hobby (one that I'm just getting into myself) with room to learn by doing, but there are definitely certain fundamentals that you should familiarize yourself with first. Replacing the caps will reduce the chance that your console will go kablooey before you can find out what (if any) other factor is causing the buzz. Have fun!