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In Reply to: RE: Thanks. posted by DRam on February 01, 2017 at 12:32:34
I was thinking you were changing a lot more caps than just electrolytics. Some equipment it does make sense to change all of them, but that is usually when there aren't that many of them. What is the receiver you are working on?
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It is a Denon DRA-1025-R receiver, a late seventies surround sound item. Only electrolytics are being considered for replacement. There are 56 caps in the amp / phono input / power sections. I'm not messing with the tuner section.
Change the 4 large capacitors in the power supply. On the amplifier board you could change the 5 physically larger electrolytics, and any larger electrolytics in the phono section and then see how it sounds.
I did something similar with a Sony surround that was about 10 years younger, but it was left on for all that time. I changed the large electrolytics in the power supply and one that had failed in the amplifier, and it has been fine.
The large power capacitors are #1 on the list. Coupling caps are also a prime target. I suspect one or more are not good as my tweeters keep frying. If my skills were good enough I could pinpoint the high frequency area of the circuit, but about all I can do is figure out which are coupling caps that might be letting DC into the circuit.
Thanks for your advice. The number to be replaced has been dramatically reduced.
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