|
When using caps in series, bleeder resistors are sort of "insurance" the caps will share the voltage. Remember, caps have rather large tolerences so a cap with -10 to +50% tolerance can vary widely from one of it's siblings. Overvolting the same cap over and over on turn on will eventually hurt it and it may go leaky making a nasty mess of it's sibling. I've always used some value around 220 k ohm across each filter up to 600 volts and never encountered any problems. There was a speaker that had 6KV power supplies for it's amplifiers IIRC that had around 15 47MFD@450 volt electrolytics all in series and used bleeders on all of them (Beveridge 2's if memory is still ok). We changed HV diodes and power trannys but never an electrolytic.
|