- the radio turns on
- the radio makes noise, and gets louder with the volume knob
- but turning the tuning knob does not move the needle or change the station
Step 1: Disassembly 1: remove knobs
On these old radios, the last thing to go on was the knobs.
Therefore, the first step for us is to remove the knobs.
These knobs pull straight off; they aren't glued or screwed on.
Pictured: the offending tuner knob. The inner knob is the AM/FM selector. The translucent ring is the tuner. You can see how it's toothed on the inside.
Step 2: Disassembly 2: open case
The back panel is wood and is screwed to the case with wood screws.
Step 3: Disassembly 3: workings
Wood tube radios will have a metal case inside protecting all the electronics. This is because the tubs run real hot and at high power, the metal case is to physically protect the fragile tubes from any jostling, and also to insulate the flammable wood from scorching from the heat of the tubes.
This metal chassis is bolted to the wood body in some way - on mine it used wood screws on the bottom. Remove what you have to and pull the metal chassis and works out of the radio body.