Be careful. When I worked for a Motorola service center, I saw these
explode when techs put them in backwards. (Do not lean over the radio
and hit the power switch.) I just checked my stash and all the tantalum
capacitors I have show a + sign on one lead. A magnifying glass helps.
Joe Hutchens ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/
On Mon, Jun 27, 2011 at 11:40 AM, Steve Berg wrote:
> I have been gradually working my way through my first Argonaut II. I
> have had troubles with the inverter circuit that drives the display
> back light. I replaced the two electrolytics in that circuit with
> tantalums of the same ratings, and while it works, the one 30 MFD
> power line bypass cap runs hot, and the display back light is dim.
> Since I have the topside switch board out to replace the back light
> switch, I want to replace the electrolytics on that board, too. It
> has been some years since I had the chance to work with tantalum
> capacitors, and I recall that the lead by the heavy black line on the
> package is the negative lead. That is how I installed them in the
> inverter circuit. Yet the one cap runs hot, the other one does not.
> Do I have a bad capacitor, or is there some other problem here that I
> am not aware of? I figured that tantalums would be much better
> capacitors than electrolytics, which is why I have been trying them.
> Am I missing something here? Can someone give me some pointers?
>
> Thanks!
>
> Steve WA9JML
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