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#16
12-14-2011, 06:09 PM
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Nowadays it's probably far less common to have electrolytics in series than it was 'back in the day'. The balancing resistors were a simple safeguard against unequal leakage values in the two caps. It wouldn't take much leakage difference to throw a higher voltage across one cap than the other, potentially exceeding its voltage rating.
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#17
12-14-2011, 07:17 PM
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I've done caps in series, usually when what I have on hand doesn't have enough voltage, and as a bonus, the capacitence too big. One radio I restored needed 475V filter caps at 50uF, so I used a pair of 100uF at 250V caps in series, and I used 470K resistors across each one to be sure the voltage would divide evenly. The resistors also will bleed off the cap charge when turning the radio off, useful when working on the radio. Oh, the bleedoff isn't very fast, but 20 seconds it's down to safer levels.
Did this in an Admiral I restored as well, plenty of room under the chassis for the extra terminal strips too.
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