[Marsupial]

We should have read this before pluging the radio the first time:
http://www.philcoradio.com/tech/plugin.htm
http://www.antiqueradio.org/powerup.htm

you can download free schematics for the 47-1227 on nostalgia air (quality is acceptable, but its free. I am looking for a better quality schematics for my 47-1230)
http://www.nostalgiaair.org/resources/605/M0013605.htm

here's an article on changing / replacing the capacitors. Helped me when I had to find replacements.
http://antiqueradio.org/recap.htm

Hope this helps.

The humming/buzzing might be due to a short. I'd really start by the basics and replace the electrolytics caps before trying to get stations running.