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Author Topic: Bulging capacitor  (Read 2079 times)
K7MDO
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Posts: 325




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« on: September 06, 2012, 11:57:06 AM »

Recently I acquired a Viking II CD transmitter that hasn't been powered for a long time.  Inspection reveals the large (apparently oil filled) 8 MFD, 1000 VDC main power capacitor has about a 1/4"+ bulge on one side.  I really can't say that it worries me too much but in checking my junk bin I find I have a new 10 MFD 1000 VDC replacement that isn't bulged and would be a direct replacement for physical fit.

Questions:  Is bulging OK or do you think it is wise to replace it?  And second, there is NO indication of +/- on the capacitor on either my extra or the one in the set.... is it immaterial with this type of cap?  Is going to 10 MFD going to impact the filtering...?

Thanks, 73, Tom
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K6AER
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Posts: 4140




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« Reply #1 on: September 06, 2012, 12:08:05 PM »

Bulging caps are bad and need replacement.

You new cap will be fine.
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AC5UP
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Posts: 4300




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« Reply #2 on: September 06, 2012, 12:15:11 PM »

...and oil filled caps like that are not polarized, so it will work either way.
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K7MDO
Member

Posts: 325




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« Reply #3 on: September 06, 2012, 01:37:39 PM »

Thanks for the answers!  I kind of suspected that answer but wanted to be sure....  the entire transmitter needs a once over before the power is applied but the capacitor was the first thing that stuck out in looking it over.  I have successfully resuscitated an Eico 720/730 pair and this Viking looks to be fraught with similar issues.  No end of fun.

73, Tom
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