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#11
March 7th 05, 09:39 PM
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wrote in message ups.com... wrote: My wife and son are both E.E.'s and their explanation is that IC's begin to degrade slowly as a result of impurituies in the wafer. Simple components like capacitors dry out and resistors begin to open up. Wish I knew more, but I can hear what they tell me in the radios I've owned. I owned one of the comparison radios, the Panasonic RF5000b. Big beast of a 24 pound radio with four antennas. It was pretty insensitive by any measure. Sure it would catch the big nighttime SW's but that was about it. Other radios, such as a Radio Shack DX150b were still pretty sensitive (and still raspy sounding) after 25 years, so the rate of degradation isn't a constant. Do a net search on "eletro-migration". Over time the electrons carry some of the ions that make junctions either P or N. Electro-migration increases with heat, I think it doubles for every 3C degree increase. This is why overclocking CPUs cn lead to unexpected failures. So, does that mean it might not be a bad idea to do some restoration work (or have it done) on the newer radios when they reach 20 years or so, sort of like the older tube radios?? I imagine that the caps last longer than the old paper caps or black beauties, but fixing up an R-70 or an FRG-7700 (if in otherwise decent shape) hadn't occured to me before. --Mike L. |
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