Hi. I could "release" some high quality paper capacitors for sale, from a transmitter set I have, if I could replace them with electrolytic types. So, is it possible to simply replace a paper capacitor in PSU service, for an electrolytic type with the same voltage rating? Thanks. Rich
Depends what the peak voltage is across the capacitors.
Most electrolytics stop at 450volts nowadays as there is no need to go any further.
Paper in oil tend to be electrically leaky due to the ingress of moisture from the air.
Most electrolytics stop at 450volts nowadays as there is no need to go any further.
Paper in oil tend to be electrically leaky due to the ingress of moisture from the air.
A series connection, with balancing resistors, can increase the voltage capability.
But watch out for high temperatures, which can decrease their useful lifetime.
The shunt resistors should swamp the typical leakage currents, to divide the voltage equally.
But watch out for high temperatures, which can decrease their useful lifetime.
The shunt resistors should swamp the typical leakage currents, to divide the voltage equally.
OK, thanks. I see that the PSU schematic shows 400V output, but that's after choke input, capacitor, choke, capacitor combination. If I can manage it, I'll see what voltage Duncan Amps PSU Designer shows at the nodes where the smoothing capacitors are. Well, it's 400V for the second capacitor, but for the first it will be higher. Then again, the highest capacitor rating is "VOLTS 400 A" and "VOLTS 600 C". Whatever "A" and "C" mean. Other markings on capacitor say "5910-99-011-2825", FEA UD", "DUBILIER B215" Military.
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There are plenty of electrolytic capacitors at higher voltages. Here is an example. Look up the series specs. https://www.mouser.com/ProductDetail/Nichicon/LGN2X151MELB50?qs=vniZgrqwd6jl6rbJLzxBfw==