8 hours ago
Hello Jeffcon,
Welcome to the Phorum. You've taken a risky step in powering up 65-year-old electronics without having some form of protection. Luck was on your side, build yourself a "dim bulb" for this purpose. Since there's noise coming from the speaker you can probably eliminate, at least for now, the possibility the speaker voice coil I bad, though it could be rubbing on the magnet. Coils don't generally wear out, they either have a break in the wire or can short circuit to an adjoining wire. To test a coil of wire you will need a multimeter set to read ohms, then test the coil with the test leads and if you get a reading on the meter the coil is intact. This is the first thing I check when I work on a radio. If any coils are open circuit then it's a good bet the radio won't work and it's good to know this early on.
Since you have already "tested" most of the circuitry you can concentrate on what should be replaced, like capacitors. You can start with the power supply filter capacitors. Those aluminum cans are electrolytic capacitors and over time they deteriorate and become ineffective. Some of them have multiple capacitors within the can, these will have more than two connections. You can replace them with multiple single units. At this point I should mention you will have to know how to wield a soldering iron. Also it's really handy to be proficient in reading a schematic diagram so you can check off parts as you replace them and you will be able to get a replacement parts list. One more thing about the power transistors, they plug into connectors and since you have removed one you will have to coat the bottom with a silicon grease so the transistor can dissipate heat to the heat sink.
Keep asking questions so we know how you're coming along. It's a lot to learn, so be patient and careful.
Welcome to the Phorum. You've taken a risky step in powering up 65-year-old electronics without having some form of protection. Luck was on your side, build yourself a "dim bulb" for this purpose. Since there's noise coming from the speaker you can probably eliminate, at least for now, the possibility the speaker voice coil I bad, though it could be rubbing on the magnet. Coils don't generally wear out, they either have a break in the wire or can short circuit to an adjoining wire. To test a coil of wire you will need a multimeter set to read ohms, then test the coil with the test leads and if you get a reading on the meter the coil is intact. This is the first thing I check when I work on a radio. If any coils are open circuit then it's a good bet the radio won't work and it's good to know this early on.
Since you have already "tested" most of the circuitry you can concentrate on what should be replaced, like capacitors. You can start with the power supply filter capacitors. Those aluminum cans are electrolytic capacitors and over time they deteriorate and become ineffective. Some of them have multiple capacitors within the can, these will have more than two connections. You can replace them with multiple single units. At this point I should mention you will have to know how to wield a soldering iron. Also it's really handy to be proficient in reading a schematic diagram so you can check off parts as you replace them and you will be able to get a replacement parts list. One more thing about the power transistors, they plug into connectors and since you have removed one you will have to coat the bottom with a silicon grease so the transistor can dissipate heat to the heat sink.
Keep asking questions so we know how you're coming along. It's a lot to learn, so be patient and careful.
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