The 7B5 is the audio output tube. A schematic is here:
http://www.nostalgiaair.org/PagesByM...3/M0013523.pdf
You might be able to pick up some strong local FM stations on your set. I have a '42 Philco console with FM and can receive the local country station at 102.1 and an oldies station 15 miles away at 95.3.