#61
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Measure the loaded voltage. There are no 'average' amperes. Compare to another transformer of the same weight, power wise.
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#62
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The two rectifiers are 1N2858 RCA, would they have caused the hum? Instead of the transformer? Been looking for a replacement transformer, but they come in many different amps.
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#63
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how do you measure loaded voltage?
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#64
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With a voltmeter, while the set is operating.
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#65
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the power transformer has been removed, I will need to put it back in, when the wall wart worked and hum was gone I removed it, now trying to figure out a replacement.
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Audiokarma |
#66
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Any ideas on the volume problem??
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#67
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I suggest measuring voltages on all the transistors to see if they are reasonable. Look at the local oscillator with an oscilloscope and verify the approximate frequency. Put a known signal into the front end and trace it through the stages.
There is no magic here. There is no substitute for understanding the circuit and having adequate test equipment. |
#68
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On my way to the local library see if they have a book on old radio circuits. Getting way beyond my knowledge of radio circuit. Hopefully I will be able to gain enough to get this set working. Been unable to find anyone in this area that works on old radios.
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#69
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I doubt if the library will be of much help. Perhaps perusing some diagrams you may find on the web will yield more useful information.
Look for germanium transistor radios, or just find the oldest solid state diagrams you can. |
#70
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Thanks, been looking via the net, but was not having much luck. Same as the library, nothing about vintage radios.
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Audiokarma |
#71
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Maybe this is similar.
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#72
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When I enlarge your diagram its unreadable. What I can see, it might be close, but again Im a newbie to this radio stuff.
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#73
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Rather than try to repair this radio just yet, perhaps you need to do some reading on how this stuff works.
You can Google the model number and perhaps get a better image of the diagram. |
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