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How to replace 12mfd 700v electrolytic

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January 30th 05, 01:29 AM

Bill M

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wrote:

Derek, The capacitors that you mentioned are indeed hard to find..
Good news is,, newer capacitors are a lot smaller and more reliable..
Take two 30MF. 450 volts caps and series them ,total will be 15 Mf at
900 V .. I would place a 80 or 100 Kohm resistor at 5 watts across each
cap. to equalize the voltage across each..By the way You can use 40 or
50 MF caps ,this will give you more filtering,better filtering ,which
is a plus..GL 73 W4PQW

You took the words right out of my mouth.
So, I'll add something. There is a school of thought nowadays that says
that newer off-the-shelf caps are so consistent that the equalizing
resistors aren't really necessary. That may be true...today. Modern
caps don't have a history of how well they hold up over the years so its
always a good idea to use the resistors even if "it works great" now
without them.

-Bill
(warm spot for the Globe Chief 90, my second Novice rig)

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