[Premium-Rx] Cubic R 2411/R 3030 blows caps

[ToddRoberts2001 at aol.com]

In a message dated 9/17/2007 11:33:10 AM Eastern Standard Time, 
alan.royce at ngc.com writes:
Hi, 
Got a R 2411 that blows the 35 volt 10u tantalums when you power it up.
Caps/tantrums, are located at the input to the plus and minus to the 16
volt line to each of the modules on the left side radio.
I have looked at the 16 volt lines and can not see any spikes on them.
I have al ready replaced at least 10 tantalums, even now replacing the
ones that I replaced before.
Any one have a clue to what is going on??
Thanks 
Al
 
 
Hi Al,
You should be using brand-new current manufacture Tantalums to replace any 
older bad ones. Sometimes those "bargain" tantalums purchased at a really low 
price a couple of years ago may not be the best ones out there. Try replacing 
with 50V tantalums. I serviced a 6790 for a friend that had a 35V tantalum blown 
in the power supply section. He had replaced it with another 35V tantalum and 
it blew again several months later. I replaced it with a 50V brand name 
tantalum from Mouser Electronics and no further problems. They are making the newer 
tantalums smaller nowadays so a current 50V tantalum is about the same size 
as a 35V tantalum of a few years ago. Always best to overrate tantalums by 
voltage. If a circuit runs 12VDC I will put a new current manufacture 35V or 50V 
brand name tantalum in if it needs replacing.
73 Todd WD4NGG



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