Value of a Tantalum Capacitor

At 06:25 PM 9/22/2014, Tothwolf wrote: I have seen tantalum electrolytics used on densely packed boards where the aluminium electrolytics of the time would have taken up much more space (the best quality aluminum electrolytics today are more compact than they were a few decades ago). I have an example in the shop at the moment - a Harris RT-1446 HF military transceiver ca. 1980 (the civilian version was the RF-350K). Unfortunately there seems to have been a problem with the 10 uF 25 V tantalum electrolytics used to bypass the +15/-15 rails where the enter each board. Many of them have failed in many transceivers, so many in fact that when I get one of those transceivers into the shop for repair one of the first things that I do is to shotgun all of those rail bypass caps. Dale H. Cook, Roanoke/Lynchburg, VA Osborne 1 / Kaypro 4-84 / Kaypro 1 / Amstrad PPC-640 http://plymouthcolony.net/starcity/radios/index.html