BL radio question

[Jeff Boatright <jboatri@emory.edu>]

I have a BL radio that I'm installing in my Sprite. The radio has a paper
sticker marked
"Serial No. B 37606
 Part No. BLM x502x"

The "x's" are numbers I can't read.

My question is: The left knob, which controls power and volume, also pulls
out with a nice little "click" - i.e., it's a pull switch, too. What is the
pull switch switching? It's not AM to FM as there's another switch for that.

Any help greatly appreciated.

Jeff

Jeff Boatright    __o_\__           '65 Austin-Healey Sprite
http://userwww.service.emory.edu/~jboatri/sprite/sprite.html