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In Reply to: MKP AC capacitor for PSU posted by SandroN on March 6, 2007 at 04:59:51:
Hi.Mathematically, 250VAC should be OK for 250x1.41421=353.55VDC.
But it can be risky unless you make it damn sure the tube heaters are all heated up well before you switch on the HV to avoid damaging surges. Is it a CLC or LCLC PS?
Follow Ups:
CLC.
rectifiers, 20uF electrolyte, 6H, 50uF motor run.
Hi.But ...for CLC where the cap charges up a surge well exceeding the theoretical DC voltage for the cap in question, I would suggest you to replace it with a higher rated DC voltage cap for long safe operation. Or serie up another cap of double the capacitance to boost up the DC safety margin.
only half the capacitance, . but twice the voltage rating . You may need to strap a couple of high value resistors across the caps for safety. Look at the example in Morgan Jones' book, if you have it.
Hi.Besides, any caps working on max. load will shorten their life span.
The motor-run oil cans I've been using got stipulation on the can body the estimated service hours on operating specified voltages.
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