Hi guys,
So, I traded a turntable for this 1990 Electrocompaniet AW75 DMB power amp. Looking over the thing, I noticed what looks like modifications to original design. See the R38 area circled (there may be more - R57?). Also Q21(2Sc3421) seems to be switched for a N832(?). Any thoughts on this? I included original schematic.
Since it seems to be working ok, my thought was to measure and adjust things like idle current, and check whatever else I can, as step one.
Now, I'm completely new at this, so the very first step will be to buy a suitable measuring tool for the job 😀. I already have a LCR meter (DER DE-5000). Advice on what to buy is welcome 🙂. I'm not an engineer, and not good at soldering - but I think I will have to anyway. But testing I can learn, I think. I have more old amps in need of service, and if I can fix or at least diagnose them myself, it would be great.
Here are some pictures+schematic. How does it look? What would you do as maintenance steps?
Regards,
Dagfinn
So, I traded a turntable for this 1990 Electrocompaniet AW75 DMB power amp. Looking over the thing, I noticed what looks like modifications to original design. See the R38 area circled (there may be more - R57?). Also Q21(2Sc3421) seems to be switched for a N832(?). Any thoughts on this? I included original schematic.
Since it seems to be working ok, my thought was to measure and adjust things like idle current, and check whatever else I can, as step one.
Now, I'm completely new at this, so the very first step will be to buy a suitable measuring tool for the job 😀. I already have a LCR meter (DER DE-5000). Advice on what to buy is welcome 🙂. I'm not an engineer, and not good at soldering - but I think I will have to anyway. But testing I can learn, I think. I have more old amps in need of service, and if I can fix or at least diagnose them myself, it would be great.
Here are some pictures+schematic. How does it look? What would you do as maintenance steps?
Regards,
Dagfinn