I suggest you find a known good speaker and hook it up in place of one of the ones that doesn't work. If you measure the speaker diameter, you can probably find a close match on eBay or Amazon. Most speakers have an 8 ohm impedance, but some are 4 ohm; they're usually marked with impedance and power rating.
Although you can check the AC voltage going to the speaker, you have to have a load on the output. Neither a multimeter or oscilloscope will have a low enough impedance to load the output; you need a speaker or 8 ohm resistor to do that.
Aside from failing speakers, the most likely causes are bad speaker wire connections or bad switches in the radio.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
... [Read Article]
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