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AC/DC radio filter cap source?
What's a good place to get some good ones, reasonable? I've got
several AA5 radios with hum and need to fix them. All my new old stock capacitors are dry. thanks Hank wd5jfr |
AC/DC radio filter cap source?
On Feb 18, 1:59*pm, "Henry Kolesnik"
wrote: What's a good place to get some good ones, *reasonable? *I've got several AA5 radios with hum and need to fix them. *All my new old stock capacitors are dry. thanks Hank wd5jfr Finding the multi- section caps may be impossible. A local parts dealer had some long skinny caps I bundled 3 of them together with heat shrink for a replacement. They were at Slayton's in Charlotte NC. Parts like that come and go there and they often dont know what they have unless its regular stock. Its a great place to browse on Saturday mornings. Jimmie |
AC/DC radio filter cap source?
"Henry Kolesnik" wrote in message ... What's a good place to get some good ones, reasonable? I've got several AA5 radios with hum and need to fix them. All my new old stock capacitors are dry. thanks Hank wd5jfr Buy new ones. Small, fresh axial and pc mount 160 to 450v. I was surprised how much smaller than the originals. http://www.nteinc.com/ |
AC/DC radio filter cap source?
"Henry Kolesnik" wrote in message ... What's a good place to get some good ones, reasonable? I've got several AA5 radios with hum and need to fix them. All my new old stock capacitors are dry. thanks Hank wd5jfr Hank Check www.dialcover.com. Bill Turner makes look-alike replacements in several values. They are good if you want to keep the underchassis appearances. Otherwise, use discrete axials. Pete |
AC/DC radio filter cap source?
|
AC/DC radio filter cap source?
Henry Kolesnik wrote:
What's a good place to get some good ones, reasonable? I've got several AA5 radios with hum and need to fix them. All my new old stock capacitors are dry. thanks Hank wd5jfr =================================== Suggest you look for good electrolytic caps in scrap (not too old) PC SMPS units . I have removed quite a few of adequate capacitance and working voltage to be used in valve (tube) type radio ,assuming AA5 radios are of the tube variety. When removed from scrap equipment , it is best to slowly cycle them (charge/discharge) a few times up to the stated working voltage . If necessary test them in a real equivalent circuit and check ripple with a scope . A bit of work ,but imho a rewarding activity. Frank GM0CSZ / KN6WH |
AC/DC radio filter cap source?
Henry Kolesnik wrote:
What's a good place to get some good ones, reasonable? I've got several AA5 radios with hum and need to fix them. All my new old stock capacitors are dry. thanks Hank wd5jfr There's places like www.triodeelectronics.com www.tubesandmore.com |
AC/DC radio filter cap source?
On Feb 18, 1:59*pm, "Henry Kolesnik"
wrote: What's a good place to get some good ones, *reasonable? *I've got several AA5 radios with hum and need to fix them. *All my new old stock capacitors are dry. thanks Hank wd5jfr Hey OM. I used to make a living selling Mallory capacitors. Mallory came out with a book called the Bird's and Bee's of electrolytic capacitors. Well the electrolyte in these capacitors does dry out, but not from sitting around in room temps. The electrolyte dries up from discharge and charge, each time of a charge or discharge cycle the electrolyte breaks down, into gas, that's why they have to be vented, or they would explode. The electrolyte also dries up if you heat them up. In the old days they used a lot of electrolyte. So why don't they have capacity? The electrolyte in old style capacitors has lots of room in between the plates and seperators, and with time the electrolyte settles via gravity, At this point the plates are no longer fully covered with electrolyte so the capacity goes down the crapper. When removed from scrap equipment , it is best to slowly cycle them (charge/discharge) a few times up to the stated working voltage . If necessary test them in a real equivalent circuit and check ripple with a scope . A bit of work ,but imho a rewarding activity. Frank GM0CSZ / KN6WH ^Is right for the most part, the key really is to ramp the voltage. from 0 to full rated WVDC, up slowly, real real real slow, like days to a week, this will wick the electrolyte back up on the plates and once again the capacitor will be usable. So a NOS capacitor off the self at room temp can be brought back from the grave 73 OM de n8zu |
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