Step 2: The AA5
The AA5 design was produced by the millions in many different incarnations using a variety of tubes. As new tube designs appeared, they made their way in to the AA5 design. You can find AA5 radios that use both 1930's designed tubes and 50's era miniature tubes on the same chassis! Despite the different tubes they used, they all follow a very similar circuit design and are an easy radio to learn to work on. There are derivatives of the AA5 that used more or less tubes but they all had the same thing in common, no power transformer.
Before cracking into that antique radio, we need to stress a few words of caution. An AA5 radio can kill you if you're not careful.
How can a radio kill you? Back to the history lesson! The AA5 radio and its derivatives use no power transformer. To pull this off one side of the line cord was connected right to the chassis. Keep in mind this was back in the day when natural selection was more the responsibility of the user and not the manufacturer. It's very important to not try to work on this radio while its plugged in. You also need be very careful not to touch any metal parts or exposed screws on the radio when its plugged in as they can be energized at line voltage potential.
Ready to dig in? Let's go!